CBSE > Class 12 > Physics | CBSE Board | Homework Help

No, the steady electric current is not the only source of the magnetic field. The magnetic field can also be produced by other sources like alternating current, a moving charged particle, a permanent magnet, changing electric field, etc.

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Prabhjot Singh 6 years, 6 months ago

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Write three properties and five uses of each electro magnetic waves

Posted by Neha Sargam 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 6 months ago

Properties of electromagnetic waves

Electromagnetic waves are transverse in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other.
Accelerated charges are responsible to produce electromagnetic waves.
Electromagnetic wave propagation does not require any material medium to travel.
The inherent characteristic of an electromagnetic wave is its frequency. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another.
The light vector (also known as the electric vector) is the reason for the optical effects due to an electromagnetic wave.

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What is electron and proton

Posted by Tanuj Poya 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Vyshnavi T P 6 years, 6 months ago

Electron and proton are the sub atomic particles present in atom. Electron will move around the orbits but proton is stationary which is located at center of the atom. Electron is negatively charged Proton is positively charged.

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Akash Kumar 6 years, 6 months ago

Electron is a positive charge and is a negative charge proton

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I want sample papers of 2019-2020

Posted by Krishna Bakliya 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

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A 12 degree Celsius resistance offered by the tungsten coil is 10ohm. Calculate the resistance of coil at 70degree celsius. Given temperature coefficient of tungsten is 4/1000

Posted by Josna Mary Thomas Thomas 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

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Compare the drift velocity 1.1×10*-3 with the thermal speed of copper at ordinary temperature and speed of propagation of electric field along the conductor which cause drift motion

Posted by Naushin Rahman 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to make practice file please help me

Posted by Aritra Choudhary 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Aditya Mishra 6 years, 5 months ago

Simple ..First of all give the knowledge about pratical topic after the topic written continous 2 or 3 time topic detail in rough notebook and also doing learn .. After some day you feel very good and 100% result in practicle..?? .. Do beleive yourself

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Solve a question with columbs law

Posted by Raghuraj Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Akash Kumar 6 years, 6 months ago

According to colums law between two charges is directly proposanal to the square of the distance between them .: |F| potposanal |q1|q2|/r2.................. sorry bhi keboards me jayada function nahi type karne thoda dikat hai

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List of derivations and formulaes in whole syllabus

Posted by Saranga Lamba 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

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

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What is the function of a condenser in an electric fan ?

Posted by Sonalrajsingh Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

S.... ????☺ 6 years, 5 months ago

Or another functioning is by motor motor can convert electrical energy into mechanical energy which create rotation in fan

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Sonalrajsingh Singh 6 years, 6 months ago

Vishal Yadav can u elaborate it a bit more assuming that this question is for 3 marks.

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Vipin Yadav 6 years, 6 months ago

the function of a condenser in fan is that it stores electrical energy and when fan switch is on it gives at once to accelerate the fan

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Explain the function of a capacitor to produce a rotatory magnetic field ?

Posted by Sonalrajsingh Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is the minimum and maximum value of dielectric constant?

Posted by Ansh Luthra 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Rajneesh Mishra 6 years, 6 months ago

[1,infinity)

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Magnetic field arises due to charges in motion. Can a system have magnetic moments even though its net charge is zero?

Posted by Jk Verma 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Pankaj Kumar 6 years, 6 months ago

Yes, for example "neutron".

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Please explain me example 5.5 (page no. 181,Part I ) of chapter 5 (magnetism and matter).

Posted by Jk Verma 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Mohmmad Zain 6 years, 6 months ago

a) PQ1 and PQ2 are not in equilibrium b) i- PQ3 and PQ6 (stable) ii) PQ5 and PQ4 (unstable ) c) U = - MBcos since at PQ3 and PQ6 the pot energy is negative but at PQ6 the potential is negative and has large magnitude due to axial magnetic field so, the potential energy is convert at PQ6

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What are the uses plant breeding

Posted by Azhaan Siddiqui 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Azhaan Siddiqui 6 years, 6 months ago

Shukriya

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Yogita Ingle 6 years, 6 months ago

Plant breeding is the manipulation of plant species in order to create desired plant types that are better suited for cultivation, give better yields and are disease resistance.

Plant breeding is done to-

Increase crop yield.
Improve quality.
Increase tolerance to environmental stresses.
Make the plants resistant to pathogens.
Increase tolerance to insect pest.

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How many of u r preparing for Jee advance and all that

Posted by Kiran??? Gautam 6 years, 6 months ago

CBSE > Class 12 > Physics

26 answers

Vinay Gautam 6 years, 5 months ago

Gud luck to all of u

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Shruti Kaushal ???? 6 years, 6 months ago

I am preparing for neet

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Nisha Sheoran 6 years, 6 months ago

Nisha ???? Sheoran

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

Bye...

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

bye

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

Haan...

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

app

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

only for now you are leaving the apl

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

Bye Ishika.....i am leaving from this app......we will meet soon...??

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

Tum karo revision....??

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

vo kr rhi thi mrng se bhai sobore ho gyi thi

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

tym waste kyu ker ri ho sister ... ? ? ? revision ker lo

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

Yeh hui na baat.....??

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

you both are right I will try to do the best kl test bhi h physics ka

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

example ke liye cbse toppers le lo.....

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

Ishika.....bio ek theory subject hai... isliye itni practice nahi hoti numerical ki... isliye jo bhi ho practice until and unless you get it ... problem mujhe bhi aati hai...par we have to do that...aur aisa socho ki physics easy hai

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

gud prepare well... nd I belive ke tum ker logi.

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

Example de do....

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

haa bhai tumhare words bahut motivate krte h and now I am serious

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

har bio student physics Mein weak ho zarrori nhi hota kuch exception hote hai... they score full marks in physics nd chemistry.... so it's all depend on ur hard work and practice.

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

concept clear kero... acche se padho. aur derivation par zyda dheeyan kero

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

actually mere paas bio h and mujhe physics k derivation me bahut prblm hoti h

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

aaise hi puccha tha

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

Haan kyu

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Î$Hîkâ Gûptâ???? 6 years, 6 months ago

rohan tumhare paas maths h kya

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

NDA is first priority latter on JEE

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ANSWER

A current carrying solenoid as equivalent to bar magnet

Posted by Sarthak Raj Sahu 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Pankaj Kumar 6 years, 6 months ago

Yes. Is any problem or confusion

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10. A long solenoid of 20 turns per cm has a small loop of area 4 cm2 placed inside the solenoid normal to its axis. If the current by the solenoid changes steadily from 4 A to 6A in 0.25, what is the (average) induced emf in the loop while the current is changing?

Posted by Vijendra Arya 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

The induced emf,
{tex}\varepsilon = - \frac{{d\phi }}{{dt}}{/tex}
{tex}\varepsilon = \frac{d}{{dt}}(BA\cos \phi )(\because \cos \phi = 1){/tex}
{tex} = \frac{{20 \times 100 \times 4 \times {{10}^{ - 4}}}}{{0.2}}{/tex} = 4 volt.

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Is hc verma is good book

Posted by Matu Mahto 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

yes it's gud if u want to crack jee mains nd advance

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Naman Shah 6 years, 6 months ago

Yes

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Is NCERT book is enough for prepration of class12 boards in physics and chemistry?

Posted by Hritwik Raj 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Naman Shah 6 years, 6 months ago

Not ncert but if u observe gujarat board text books it is enough for preparation of board exams and also useful for jee

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Kiran??? Gautam 6 years, 6 months ago

For chemistry its enough bt nt 4 physics selecy any teference book

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Matu Mahto 6 years, 6 months ago

Not enough

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Arunima Devi 6 years, 6 months ago

Yes ofcourse bt don't directly go to ncert firstly watched vedios of all related concept of that chapter then start reading ncert you will observe 100% of it Really ncert iz just ❤️❤️❤️

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If four identicalcharged speres q are kept at vertices of regular pentagon then force acting on -q at centre id

Posted by Ayesha Rahman 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sushila Bhagat 6 years, 6 months ago

zero

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Q charge Is placed

Posted by Golden Times 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Kiran??? Gautam 6 years, 6 months ago

So what plz type the whole ques

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What is the cost of the dc

Posted by Rahul Chauhan 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

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what is the dimensional formula of potential gradient

Posted by Ansh Luthra 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Ansh Luthra 6 years, 6 months ago

how it is Q and R

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Rushda Faheem 6 years, 6 months ago

[M^0 L^-1 T^-1 Q^1R^1]

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1Tesla=?Gauss

Posted by Suraj Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Harsh Mohil 6 years, 6 months ago

10⁴

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Aditesh Singh 6 years, 6 months ago

1 Tesla = 10^4 Gauss

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Premesh Tyagi 6 years, 6 months ago

10^4 gauss

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Bhawna Thakur 6 years, 6 months ago

1 Tesla =10⁴ Gauss

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Differentiate between AC and DC current.

Posted by Parul Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Akshita Saini 6 years, 6 months ago

AC change its direction but DC did not change its direction AC has frequency but DC has neglected frequency

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Premesh Tyagi 6 years, 6 months ago

DC current DC current only in single direction but AC current is changed in the direction

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Bhawna Thakur 6 years, 6 months ago

DC current flows steadily in single direction whereas AC current keep changing its direction.

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Find the ratio of capacitance of a capacitors filled with two dielectrics of same dimensions but of dielectric constant k1 and k2 respectively.

Posted by Kaviya Rathi 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 6 months ago

Question: A capacitor is filled with two dielectic of same dimension but of dielectric constant k1=2 & k2=3 respectively.find the ratio of capacitance in two possible arrangement.

The answer is given below:

If a capacitor is filled with two dielectrics with the same dimension, only the following two arrangements are possible:

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