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Mohit Yadav 6 years, 1 month ago

Book main dekh le yr

Yogita Ingle 6 years, 1 month ago

Moving coil galvanometer is an electromagnetic device that can measure small values of current. It is also known as Weston galvanometer.
It works on the principle that when a current loop is placed in an external magnetic field, it experiences torque, and the value of torque can be changed by changing the current in the loop
Moving coil galvanometer consists of permanent horse-shoe magnets, coil, soft iron core, pivoted spring, non-metallic frame, scale and pointer
We know that a current loop having N number of turns,and the cross sectional area A, carrying current i, when placed in and along the direction of external magnetic field B, experiences a torque given by:

ԏ = NiAB

3Thank You

Vaishnavi Kalvakuntla 6 years, 1 month ago

A device to detect flow of current

ANSWER

Distinguish between resistance, reactance and impedance.

Posted by Sohan .G 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 1 month ago

Resistance	Impedance
It is used in DC circuits	It is used in AC circuits
Resistance can be seen in both AC and DC circuits	Impedance can be seen only in AC circuits
It happens due to resistive elements	It happens due to reactance and resistance
It is represented by letter R	It is represented by letter Z
It is represented using real numbers such as 5.3 ohms	It is represented using real and imaginary values such as R + ik
It does not vary depending upon the frequency of DC current	It varies according to the frequency of AC current.
It does not have a magnitude and phase angle	It does have a phase angle and magnitude
If kept in a electromagnetic field, it only shows the power dissipation	If kept in a electromagnetic field, it shows power dissipation and energy stored

ANSWER

All units of power

Posted by Ayush Dubey 6 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Vinay Gautam 6 years, 1 month ago

Yeh net se post ki h directly stupid

Neha Choudhary 6 years, 1 month ago

Yogita ingle apko iti sare units learn h

Yogita Ingle 6 years, 1 month ago

Units	Abbreviation	Equivalent Watt Unit
Horsepower	HP	746 watts
Kilowatts	kW	1×10³W
Megawatts	MW	1×10⁶W
Gigawatts	GW	1×10⁹W
decibel-milliwatts	dBm	30 dBm = 1 W
British Thermal Unit	BTU	3.412142 BTU/hr = 1 w
Calories per Second	cal/sec	0.24 calories per second cal/sec = 1 W

Sohan .G 6 years, 1 month ago

Watt

ANSWER

What is the direction of magnetic field in the toroid

Posted by Tanuj Kumar 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vaishnavi Kalvakuntla 6 years, 1 month ago

Into the plane

ANSWER

A circular coil of radius 4cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5weber/m². Calculate the magnetic dipole moment of the coil?

Posted by Abhay Kashyap 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Pukhrimayum Nawaz Khan 6 years, 1 month ago

Define Declination?

ANSWER

In semiconductor if temperature increases resistance decreases while in conductor temperature increases resistance also increases . Why?

Posted by Saurabh Jaiswal 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Komal Kumar 6 years, 1 month ago

Because in conductor electrons donot require more energy for going in conductipn band from vvalenceband.this energy is obtained from increasing of temperature as from kinetic theory of molecules.tge excess energy dors tge wirk to perform joule effect which increase resistance while in semiconductor electrons require considerable energy for band jumping.thus here increasing pf temperature performs positive results and increase the energy of electron thus the resistance decrease

Mohit Sharma 6 years, 1 month ago

These are depends on relxatation time

Ayush Ahlawat 6 years, 1 month ago

Because in conductor temperature increses outermost electrons are free to move and energy lose

ANSWER

The direction of the current is anticlockwise.As north polarity of solenoid is moving towards the loop.So,to stop the motion of solenoid.Current will induced in the coil in anticlockwise direction (N-pole)

Posted by Amol Gùpta 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ayush Ahlawat 6 years, 1 month ago

Because of self induction

ANSWER

To study variation in potential drop with lenght of wire for steady current experiment with readings

Posted by Jasmandeep Kaur 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Parth Lalka 6 years, 1 month ago

(P/q) =(R/s)

ANSWER

Derivation if q factor

Posted by Santosh Mishra 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Muskaan Vig 6 years, 1 month ago

Simplest derivation........ Q=VL/E........(where VL is voltage across inductor and E is total voltage applied).. Q=lXL/IZ........(where I is current and XL is reactance of inductor and Z is impedance ... Q=XL/Z............ Q=XL/R.........(because in LCR circuit Z=R) Q=wL/R.........(L is inductance here and w is omega actually)... Q=L/R√LC.....(because w=1/√LC in resonant LCR circuit)..... Therefore Q=1/R√L/C.....where C is capacitance of capcaitor...same derivation can be done using Vc instead of VL result will be same....

ANSWER

Sir I want to top in physics whicH book I prefer now at end and sample paper

Posted by Rahul Phogat 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Saurabh Jaiswal 6 years, 1 month ago

Solve all questions of NCERT book .

ANSWER

What is scalar quantity?

Posted by Prajjwal Patel 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vaishnavi Kalvakuntla 6 years, 1 month ago

Only magnitude is considered and direction not considered

ANSWER

A square abcd of sode 20 cm has 4 charges on ots corner 3q ,_3q, 6 q and _6q find the force on the center when 3 columb charge is placed

Posted by Shyam Pandey 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Can we can make printed project file

Posted by Ayush Upadhyay 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ishita Ishita 6 years, 1 month ago

ANSWER

Plz someone tell me when is physics practical exam??

Posted by Ishita Ishita 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Ess baar board exam mein set hogey yaa naii???

Posted by Anmol Benipal 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What curvature must be given to the bounding concave surface of refracting medium (u=3/2) for a virtual image at 40 cm of an object in this medium at a distance of 60 CM. The adjoining medium is air (u =1).

Posted by Sourabh Garg 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Aditi Pandey 5 years, 1 month ago

answer???

Sourabh Garg 6 years ago

Hlo

ANSWER

Two identical point charges, q each, are kept 2m apart in air. A third point charge Q of unknown magnitude and sign is placed on the line joining the charges such that the system remains in equilibrium. Find the position and nature of Q.

Posted by Ramesh Prasad 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Varsha Thory 4 years, 9 months ago

Separation between both q charges is l and let us say Q is x m away from one charge .so it will be l-x away from another charge It is given that the system is in equilibrium, net force on each charge is zero. We know ,Fields on Q due to both charges having magnitude q are equal. kq/x^2=kq/(l-x)^2 x^2=(l-x)^2 x=l/2 x=1m Also force on charge q is zero . KqQ/l^2+kqq/(l-x)^2=0 -q/4=Q

ANSWER

, Important ques of unit 1,2,3

Posted by Neha Mothsra 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Kisi k school mein practical hue h? If yes,tell me how it was?

Posted by Jk Verma 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two applications of cyclotron?

Posted by Mannat Kaur Khalsa?? 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Udho Shukla?? 6 years, 1 month ago

To insert a charged particle on the surface of metal . To increase the energy of charged particle

3Thank You

ANSWER

A wire resistance 4R is bent in the form of a circle. What is effective resistance between the ends of diameter?

Posted by Sumit Kumar 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shivam Singh 6 years, 1 month ago

Râhūl ;-),?? 6 years, 1 month ago

2R ,2R

ANSWER

An accident in a nuclear laboratory resulted in deposition of a certain amount of radioactive material of half life 18 days inside the laboratory. Tests revealed that the radiation was 64 times more than the permissible level required for safe operation of the laboratory. What is the minimum number of days after which the laboratory can be considered safe for use? (A) 64 (B) 90 (C) 108 (D) 120

Posted by Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

CBSE > Class 12 > Physics

12 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

accha socha tum dono ne choro mujhe. gud bye.

Rohan Řąjpůť 6 years, 1 month ago

bhai mai kya bol raha hoon chor na isay. ????

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

actually bro mujhe kisi ka sry chahhiye bhi nhi. ????

Řøhăň Řąjpůť ✌️✊ 6 years, 1 month ago

bro rehne de na... zarrort kya hai I don't think ke kuch wrong bola hai. ??

Řøhăň Řąjpůť ✌️✊ 6 years, 1 month ago

?????

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

thoda limit mein bol.

Řøhăň Řąjpůť ✌️✊ 6 years, 1 month ago

? ? ? tu pgl ho gyi hai kya pdh pdh kr. ??? itna simple question puch rhi hai. ? ?

Amol Gùpta 6 years, 1 month ago

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

thanks ? ?

Amol Gùpta 6 years, 1 month ago

Time required= 6half lifes =6 × 18 =108

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

yes...correct hai hint DE do iska bus

3Thank You

Amol Gùpta 6 years, 1 month ago

C-108 is the answer

ANSWER

Working of cyclotron

Posted by Lisha Rahangdale 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 1 month ago

Cyclotron:

Cyclotron is a device used to accelerate charged bodies to very high velocities (or high kinetic energies) using crossed (or mutually perpendicular) electric and magnetic fields
Cyclotron is based on the independency of frequency (of rotation of charged particle) on the energy (velocity) and radius (of revolution) of charged particle. The motion of charge , electric field, and the magnetic field are mutually perpendicular(θ= 90°), so:

fc = 1/T = qB(sinθ)/(2πm) = qB/(2πm)

Cyclotron is made up of 2 hollow metallic discs D1 and D2, semi-circular in shape and an oscillator.
The discs(D) perform mainly 2 functions: a) to block(shield) electric field inside it (known as electrostatic shielding) b) act as a capacitor outside the region between the 2 discs to provide some electric field
The oscillator’s job is to reverse the direction of electric field at the time interval of eachrevolution of charge, meaning frequency of oscillator fo should be same as the frequency of cyclotron fo.It is because when the charge moves from one D to another, the direction of electric field should always be such that the charge always accelerates(and never decelerates)

ANSWER

Preboards kiske aache hua.

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mannat Kaur Khalsa?? 6 years, 1 month ago

Mere to 15 see hai....

Râhūl ;-),?? 6 years, 1 month ago

Mere?

ANSWER

Something about practical examination like questions

Posted by Gaurav Shukla 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Vinay Gautam 6 years, 1 month ago

Anything

Neha Choudhary 6 years, 1 month ago

She or he may ask questions from any chapter along with practical

ANSWER

Anyone knows how to cover all the things in physics???

Posted by Anuj Maurya 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shivam Singh 6 years, 1 month ago

Give more time to physics

Shivam Singh 6 years, 1 month ago

Badi jaldi puch liya

ANSWER

About Nucleons

Posted by Mushahid Khan 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Vinay Gautam 6 years, 1 month ago

Neutrons and protons

Om Kumar 6 years, 1 month ago

Nucleons are the particles which are present inside the nucleus (neutron,proton).

ANSWER

Curie law?

Posted by Mannat Kaur Khalsa? 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Rajat Barwar 6 years, 1 month ago

Acc. to this law the susceptibility of a ferromagnetic material is inversely proportional to temp. and after a certain temp. the material loses its ferromagnetic prop. and becomes paramagnetic ( called curie's temp.).... The below given answer is also a point. Hope this may help you...

Rahul Kulhari 6 years, 1 month ago

The curie law states that in a paramagnetic material, the material magnetization is directly proportional to an applied magnetic field