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ANSWER

Refraction of light through a rectangular glass slab

Posted by Parmod Hooda 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

When a ray of light is incident on a rectangular glass slab, it gets refracted. After the refraction it comes out from glass slab. It gets a interface of a glass and the air (another medium). So it deviates away from normal. Since, the glass slab is rectangular and both sides of the glass slab have the same medium. The light refracts in such a way that incident and emergent rays are parallel.

ANSWER

An electric dipole is held in a uniform electric field so that no translatory force act on it drive an expression for the torque acting on it the dipole is a line parallel to the field calculate the work done in rotating it through 180 degree

Posted by Akash Akashrajput 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Mudit Kashyap 6 years, 5 months ago

Work done is maximum

ANSWER

An electric field is held in a uniform electric field so that no translatory force act on it

Posted by Akash Akashrajput 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Mudit Kashyap 6 years, 5 months ago

Zero work done

ANSWER

Using ampere circuital law obtain an expression for the magnetic field along the axis of a current carrying solenoid of length l

Posted by Sourabh Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Suggest any idea about physics half yearly papers according to new objective type questions please

Posted by Sahij Preet 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

In my schl... they give 20 marks objectiv type question which include numerical nd some conceptual type question. nd after that there are 2 marks, 3 marks nd 5 marks question... numerical contain approx 15 to 20 marks nd rest is reasoning type question.

ANSWER

A wire of resistivity 'p'is streched to double if length .what will be its new resistivityb?

Posted by Sakshi Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Mudit Kashyap 6 years, 5 months ago

Become half

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

It's resistivity will remain same becoz resistivity doesn't depend upon length and area of cross-section. it is depend upon nature of the material of conductor.

3Thank You

ANSWER

Any girl who wanna chat??

Posted by White Rat Hackers ? Ceo 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

I am not interested.. mere pass already bahut kaam hai...

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Haa bhai inn ko baat karni hai inhi se puccho.....?

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

kyu bhai India ke ladko ko AIDS ho gya hai Jo unsay nhi puchega.

4Thank You

ANSWER

How to minimise eddy current . State three methods ?

Posted by Nona Shrivastav 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Nishu Goyal 6 years, 5 months ago

By laminating

Gaurav Seth 6 years, 5 months ago

Eddy currents are the currents induced in the body of a conductor due to change in magnetic flux linked with the conductor.

Applications of eddy currents are:

a) Electromagnetic damping - Designing dead beat galvanometer

b) Induction furnace

c) Magnetic brakes

d) Electric power meters

e) Induction motor

To minimise eddy currents, the metal core to be used in an appliances like motor is taken in the form of thin sheets. Such a core is called laminated core. The planes of these sheets are arranged parallel to the magnetic field so that they cut across eddy current paths.Large resistance between the thin sheets confines the eddy current to the individual sheets. Hence eddy currents can be reduced to a large extent.

ANSWER

Ideal gas equation

Posted by Sunil Prasad 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Tripti Rawat 6 years, 5 months ago

We know that volume V of gas is

directly proportional to the quantity of gas i.e., number N of molecules contained in the gas. Mathematically,
{tex}V \propto N{/tex} (if P and T are constant)
inversely proportional to pressure P. Mathematically,
{tex}V \propto \frac{1}{P}{/tex} (if N and T are constant)
directly proportional to temperature T. Mathematically,
{tex}V \propto T{/tex} (if N and P are constant)

Combining all these, we have {tex}V \propto \frac{N T}{P}{/tex}
{tex}\therefore{/tex} {tex}\frac{P V}{N T}{/tex} = constant = k_B = Boltzmann's constant
Generally, N is written as N = {tex}\mu N_A{/tex}, where N_A is the number of molecules in one mole of gas and {tex}\mu{/tex} = quantity of gas in moles.
Hence, the above relation becomes
{tex}\frac{P V}{T}=N k_{B}{/tex} = {tex}\mu N_{A} k_{B}=\mu R{/tex}
Here R = {tex}\mu \cdot N_{A}{/tex} = gas constant for one mole of gas
or {tex}P V=\mu R T{/tex}
It is the ideal gas equation or equation of state for an ideal gas.

Mudit Kashyap 6 years, 5 months ago

Pv-nrt

Yogita Ingle 6 years, 5 months ago

Ideal Gas Equation

The gases following Boyle’s law, Charles’law and Avogadro law firmly are termed as anideal gas.
From Boyle’s law we have V ∝ 1/p (Constant T, n)
From Charles’ law we have V ∝ T (Constant p, n)
From Avogadro’s law we have V ∝ n (Constant T, n)
Combining them we get, V ∝ nT/p
or V = nRT/p

pV = nRT ………………………… (IDEAL GAS EQUATION)

R =pV/nT

R= Gas Constant. It is same for all gases.

ANSWER

AC voltage applied to LCR circuit

Posted by Nishant Sharma 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Mudit Kashyap 6 years, 5 months ago

Also

Saurabh Monty 6 years, 5 months ago

Yes

ANSWER

Why generator is misnomer

Posted by Amanpreet Kaur Randhawa 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Daksh Singh 6 years, 5 months ago

If u called a generator a A.C generator and still isn't working or can't used to generate energy then it may be called as a misnomer. Misnomer is used to refer to an incorrect name given to a device . Thus , the term generator in name A.C generator is usually a misnomer .

3Thank You

ANSWER

State any 2 methods for making permanent magnet

Posted by Aga Iqra 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Jk Verma 6 years, 5 months ago

The efficient way of making permanent magnets is to place a ferromagnetic rod in a solenoid and pass a current. The magnetic field of the solenoid magnetises the rod. 2).One can hold an iron rod in the north-south direction and hammer it repeatedly. 3).One can also hold a steel rod and stroke it with one end of a bar magnet a large number of times,to make apermanent magnet.

ANSWER

Is current a scaler quantity or vector??

Posted by Ajay Singh Ajay Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

7 answers

Abhay Yadav 6 years, 5 months ago

Current is neither vector nor scaler. It only behaves as scaler

Akhil Kumar 6 years, 5 months ago

Scaler

Naitik Tayal 6 years, 5 months ago

Current is scalor bcz it does not obey law of vector addition

Jk Verma 6 years, 5 months ago

Current is a scalar quantity as it does not obey vector's laws of addition. But " current density " is a vector quantity.

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Vector..??

S.... ????☺ 6 years, 5 months ago

Current is an vector but it cannot obey laws of vector addition

Alisha Jajodia 6 years, 5 months ago

Vector,because it has direction.

ANSWER

In chapter 5 (magnetism and mater) Q5.15 of ncert exercise How is B=H at 45°?

Posted by Jk Verma 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Together with solutions

Posted by Surbhi Dabas 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Anshul? Singh 6 years, 5 months ago

ANSWER

when are the electric fields curved?

Posted by Hardik Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Pragati Saini 6 years, 5 months ago

electric field lines are curved, as in the case of an electric dipole. An electric dipole consists of two separated point charges that have the same magnitude but opposite signs.

ANSWER

Why capacitor is a scaller quantity and resistance is not scaller quantity.

Posted by Ilma Ansari 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Pragati Saini 6 years, 5 months ago

Resistance is a scalar quantity okkk and capacitance is also a scalar quantity as it has magnitude, but it has not direction.

Pragati Saini 6 years, 5 months ago

Resistance is a scaler quantity as it only has a magnitude. ... Some people have a misconception about resistance is that they equate resistance with a frictional force inherent in a conductor. So, they expect that resistance should be a vector quantity, antiparallel to the direction of the current.

ANSWER

Does sl arora physics book benefitted us for class12

Posted by Shruti Gupta 6 years, 5 months ago

CBSE > Class 12 > Physics

6 answers

Sia ? 6 years, 5 months ago

yes it can be useful for class 12th

Mudit Kashyap 6 years, 5 months ago

For 80 mark

Sanjay Choudary 6 years, 5 months ago

HC verma is better than all these books...

Amol Gùpta 6 years, 5 months ago

Rohit apna question to check kiya nhi hoga tumne

Anshul? Singh 6 years, 5 months ago

S chand is better

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 5 months ago

Yes many numerical U got and clear concepts also By S.L Arora book

ANSWER

A resistanceof 1980 ohm is connected in series with a voltmeter after which the scale division becomes 100 times larger. Find the of the voltmeter.

Posted by Yogesh Baghel 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

Voltmeter is always connected in parallel to a circuit. Since Galvanometer is a very sensitive instrument, therefore it can not measure high potential difference. In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer.

ANSWER

Alternating current can not be measured by dc ammeter because

Posted by Bina Devi 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Mudit Kashyap 6 years, 5 months ago

Ac has change polarity

Bina Devi 6 years, 5 months ago

ac cannot pass through dc ammeter

ANSWER

How can i complete whole course in 5 months?

Posted by Manish Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Mudit Kashyap 6 years, 5 months ago

Manika Gupta 6 years, 5 months ago

Hard work

Pritesh Purohit 6 years, 5 months ago

vo tum jaano

ANSWER

Can you tell me all the formulas of physics

Posted by Ashish Dabas 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Sia ? 6 years, 5 months ago

You can check formulaes here: https://mycbseguide.com/cbse-revision-notes.html

Parmod Hooda 6 years, 5 months ago

What is optics

Soham Star 6 years, 5 months ago

ANSWER

Chapter 4 physics 4.15 Question solution But smj ni aya

Posted by Aviral Saxena 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

Magnetic field strength, B = 100 G = 100 × 10 - 4 T
Number of turns per unit length, n = 1000 turns m - 1
Current flowing in the coil, I = 15 A
Permeability of free space, {tex}\mu_{0}=4 \pi \times 10^{-7} T m A^{-1}{/tex}
Magnetic field is given by the relation, {tex}B=\mu_{0} n I{/tex}
{tex}\therefore n I=\frac{B}{\mu_{0}}{/tex}
{tex}=\frac{100 \times 10^{-4}}{4 \pi \times 10^{-7}}=7957.74{/tex}
{tex}\approx 8000 \mathrm{A} / \mathrm{m}{/tex}
If the length of the coil is taken as 50 cm, radius 4 cm, number of turns 400, and current 10 A, then these values are not unique for the given purpose. There is always a possibility of some adjustments with limits.

ANSWER

What is motional emf and its SI unit

Posted by Dileep Maurya 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

Where, the speed of conductor (PQ), v = -dx/dt and is the formula of induced emf. This induced emf due to the motion of an electric conductor in the presence of the magnetic field is called motional emf. SI unit is volts.

ANSWER

Cyclotron easy working

Posted by Sameera Kamboj 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Mudit Kashyap 6 years, 5 months ago

Its work is care fully to explose the bomb

Vivekanand Yadav 6 years, 5 months ago

When a particle protium and deuterium is placed between two dees it higly geta accelerated.Also makes circular path and escapes oit.

ANSWER

Should I have to apply both the exams of jee mains or once applying is enough for both exams??

Posted by Sanjay Choudary 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Sia ? 6 years, 5 months ago

Apply for Jee mains first and after clearing mains you will be qualified for advance.

Sanjay Choudary 6 years, 5 months ago

Oyy sia... I'll clear don't worry!!!

ANSWER

Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields?

Posted by Jk Verma 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

No, the permeability of ferromagnetic material is not independent of the magnetic fields, Its value is greater for lower fields.

ANSWER

Proof magnetic field due to ring and solenoide.?

Posted by Demon King 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 5 months ago

A solenoid is a long circular coil containing a large number of close turns of insulated copper wire. When a electric current is passed through the solenoid, it produces magnetic field around it as shown in fig. Magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet. As is clear from the figure, the lines enter from the left side and leave out from the right side. If we look from left side, the current appears to be passing in the coil in clockwise direction and hence it acts as a south pole according to clock rule. If the coil is viewed from right side, the current appears to be in anticlockwise direction. Hence, left-hand side face behaves as if this were a north pole. If the coil is left free, it will point South and North.
Since the current in the turns of the solenoid flows in the same direction, the magnetic field produced by each turn of the solenoid adds up, giving a very strong resultant field inside the solenoid. Hence, a solenoid may be used in making electromagnets.

ANSWER

Principle,working and construction of a.c generator

Posted by Prabhjot Kaur 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

✴️construction :- amateure coil - it is rectangular coil wound over the soft iron core. ✴️ Field magnet =these are the two concave shape magnet poles in b/w armature coil be placed. ✴️ Slip ring =these are the two metallic ring S1 nd S2 from which two ends of armature coil ate connected. ✴️ Brushes =these are two metallic plates B1 nd B2 which are connected from s1 nd s2.

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

working = suppose coil is placed perpendicular to the field so, that area vector is ll to the magnetic field. if pQ moves downwards then by Fleming r8 hand rule direction of induced current is from Pto and Rto S in the coil. while in external circuit from B1 to B2. After half rotation PQ moves upward and by Fleming r8 rule direction of current in the coil is from Q to p and s to R. while in external circuit it is from B2 to B1 hence the obtain current is alternating in nature.

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

principle :- it is based on the fact that an emf is induced in the coil when there is charge in flux linked with the coil.