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

Ask questions which are clear, concise and easy to understand.

Ask Question

Why charge present in conductors spread onto their surface but stays at their original place in case of insulators

Posted by Anjali Sharma 6 years, 5 months ago

1 answers

Because in conductors there is a presence of free electrons whereas there are no free electrons in the case of insulators.That is why,charge flows in case of conductors but it doesnot move in insulators.?

0Thank You

ANSWER

Two point charges Two point charges Q1 = 2 + 0.2 column and Q2 = 2 + 0.4 coulomb are placed 0.1 metre apart calculate the electric field at the midpoint between the charges a point on the line joining Q1 Q2 such that it is 0.05 metre away from Q2 and 0.15 metre away from Cuban

Posted by Pushpendra Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why do the electrostatic field lines not form closed loops?

Posted by Ruchi Harariya 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why charge in a metallic conductor distributed uniformely

Posted by Suraj Kumar Verma 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is frictional unit of charge?

Posted by Sumit Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Magnitude of each charge of electric dipole is 2 micro coulomb and two charges of dipole are at distance 10 angstrom from each. If P is a point, at distance 2 cm from mid point of dipole ,at angle 60 degree with the direction of p vector( electric dipole moment vector) then calculate electric field intensity at point P

Posted by Vishakha Rathore 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is ray optics excluded from syllabus?? I have a huge confusion in this...solve it plz

Posted by Lavi Baliyan 6 years, 5 months ago

CBSE > Class 12 > Physics

5 answers

Lavi Baliyan 6 years, 5 months ago

Thanks guys

0Thank You

Ananya Singh 6 years, 5 months ago

No!!

1Thank You

Mandavi Tripathi 6 years, 5 months ago

1Thank You

Div¥@N$Hi P@M@® 6 years, 5 months ago

No!!

1Thank You

Priya Dharshini ? 6 years, 5 months ago

It is there in syllabus. It is not excluded. If u have doubt u can check in google

4Thank You

ANSWER

Two charges 30 music and minus 30 placed in centimetres apart calculate electric field at a point on the axial line

Posted by Keshav Choudhary 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How we find torque in non uniform electric field ?

Posted by Ayush Kumar Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If 10j of work is to be done in moving a charge from A to B , which of the two points is at higher potential

Posted by Kapil Dubey 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Yeh unity matpab kya hota hai ??? Iske value one hoti hai zero

Posted by | | | {R J } .....! ! !: ; 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Aman Kumar 6 years, 5 months ago

Unity matpab one hi hota hai...

1Thank You

ANSWER

Chapter 15 cut h 2019-2020 ke cbse slaybus me se isbar

Posted by Vishu Dhindsa 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Manika Gupta 6 years, 5 months ago

Yessss

0Thank You

ANSWER

Can we get 2same value of 2 different angles of deviation while doing practical?

Posted by Manu Manu 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Manika Gupta 6 years, 5 months ago

No...it will always vary.....if we measure avvurately thrn we get difference of points may be digits before decimal are same but they may vary after decimal..

0Thank You

ANSWER

Jb ionisation process start ho jata h Conductor me to electric field increase hone lagta r leakage start ho jata h. To electric field kaise decrease hoga? R ager electric field decrease krenge to charge b decrease hoga?

Posted by Nasra Javed 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two conducting wire of same diameter but different material, are joined in series across a battery .If the number of density of electron in 'x' is twice that in 'y' find the ratio of drift velocity of electrons in the two wires. Plz reply soon...

Posted by Lavi Baliyan 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Muskan Chouksey 6 years, 5 months ago

V=I/A v=drift velocity A=cross section area n=charge density I=current I is inversely proportional to the charge density/no. density of electrons Assume charge density be A in conductor y so in conductor x charge density will be 2(A) So, v in X/v in Y= 1/2 Do tell if the right or wrong?

0Thank You

ANSWER

Why we use non polar dielectric instead of polar dielectric in between the parallel plate capacitor?

Posted by Nasra Javed 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two wire of equal length one of copper other of manganese have same resistance.which wire will be thicker??

Posted by Lavi Baliyan 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Lavi Baliyan 6 years, 5 months ago

Reason behind manganese is thicker???how to calculate this suggest me plz...

0Thank You

Pragati Gola 6 years, 5 months ago

0Thank You

Ankita Kumari 6 years, 5 months ago

Manganese hoga

0Thank You

ANSWER

The force between two charges is F and distance between them is small d . what is force between them if they are kept n water?

Posted by Kunnal Kunnal 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Vishal Mourya 6 years, 5 months ago

Dielectric constant of water = 80 Then force is F/80

0Thank You

Ayushi Ayushi 6 years, 5 months ago

Let two charges are q1 and q2 and they are kept in water. And distance between them is d . F= 1/4£€oK q1×q2/d^2

2Thank You

ANSWER

What is point charge

Posted by Yudhishthir Sahu 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Amit Yadav 6 years, 5 months ago

Whose radius is neglible with compare to its distance from related element

2Thank You

ANSWER

Four point charges Q, q, Q, qare placed at the corners of a square of side a 1. Force on charge Q 2. Potential energy of the system

Posted by Hardeep Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Ankita Kumari 6 years, 5 months ago

Phir se sorry yaar a ke jagah 1lena thik n side ka value diya h n

1Thank You

Ankita Kumari 6 years, 5 months ago

Force wale mein kqQ/a^2

1Thank You

Ankita Kumari 6 years, 5 months ago

Force =kqQ hoga n u=k(4underroot2 +q^2+Q^2)underroot 2 a plzz reply jaror karna ans shi h ki galat thik n

1Thank You

ANSWER

Unit of charge

Posted by Deepanshu Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

7 answers

Ruchi Harariya 6 years, 5 months ago

Columb

0Thank You

Ananya Singh 6 years, 5 months ago

Coulomb?

0Thank You

Manish Yadav 6 years, 5 months ago

Franklin

0Thank You

Hritik Kumar 6 years, 5 months ago

Columb

2Thank You

Yogita Ingle 6 years, 5 months ago

The SI unit of electric charge is coulomb. The c.g.s. unit of charge is stat coulomb.

1Thank You

Riya Gautam 6 years, 5 months ago

Coulomb

1Thank You

Hardeep Singh 6 years, 5 months ago

Coulomb

2Thank You

ANSWER

A 10cm long rod carries a charge of +50uc distributed uniformily along its length .Find the magnatic of the electric field at a point 10cm form both the ends of the rod

Posted by Chandan Kumar Prabhakar 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Priya Parihar 6 years, 5 months ago

0Thank You

ANSWER

if number of electric field lines entering are equal to the number of electric field lines leaving the surfa ce what is the net flux on the surface

Posted by Gulab Chandra 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Bharat Chaudhary 6 years, 5 months ago

Zero

0Thank You

ANSWER

The electric field due to a positive charge at a distance 2 m is 4 N/C . Its magnitude at distance of a 4 m will be ?

Posted by Pulkit Aggarwal 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Ankita Kumari 6 years, 5 months ago

Its magnitude is 1N/c

0Thank You

ANSWER

2019 Physics paper pattern

Posted by Sumit Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Charges +2nc.+4nc,and +8nc are placed at the corners ABC respectively of a square of side 0.2m.Calculate the work done to transfer a charge of +2nc from the corner D to the center of the square.

Posted by Priya Dharshini 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why dq =lambada dl in the electric field due to infinite long conductor

Posted by Rajandra 123 Kumbhkar 456 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Jasnoor Grewal 6 years, 5 months ago

Infinite long conductor ki linear charge density hai lamda and lamda=q/l Where q=charge on conductor and l=is the length of conductor But when we divide the condutor into small parts of length dl each;then charge on a small part is also dq Then lamda=dq/dl (bcz lamda is constant) or we can write dq=lamda×dl. Hope u get it. Thnx.

2Thank You

ANSWER

Which reference Book is good for board perpous . exam idea , SL Arora , Dinesh . which one is good and not more stuff for study in book

Posted by Naman Jain 6 years, 5 months ago

CBSE > Class 12 > Physics