Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details
Get extra R 700 off

				   two long,charged,concentric cylinders have radii of 3.0 and 6.0 cm. The charge per unit length is 5.0*10^-6 C/m on the inner cylinder and -7*10^-6 C/m on the outer cylinder. Find the electric field at (a)r=4cm (b) r =8 cm,where r is the radial distance from the common central axis.

7 years ago


Answers : (2)


it is a basic question of the GAUSS LAW. Simply apply the Gauss Law at the two cylindrical gausian surfaces having its axis same as the cylinders and the radius 4 and 8 cms respectively.  In case of second the total charge wud be -2 micro coulumb. See  the length of the hollow cylinde does not matter . Hope u understand why!!!!!!!!1

7 years ago


Acc to gauss law, electric field wud be only because of the charge enclosed.

 Gauss's law, also known as Gauss's flux theorem, is a law relating the distribution of electric charge to the resulting electric field. Gauss's law states that:

The electric flux through any closed surface is proportional to the enclosed electric charge.

In integral form  the equation is: \oint_S \mathbf{E} \cdot \mathrm{d}\mathbf{A} = \frac{Q_{\mathrm{enclosed}}}{\varepsilon_0}

In this case , for r=4cm , electric field will be only because of the inner cylinder , bcoz as we draw the gaussian surface outside the inner cylinder but inside the outer cyl, the charge enclosed is just 5x10-6 . So, in the gauss law, put q enclosed equal to 5x10-6 .  .

In second case, draw gaussian surface outside the second cyl, hence net charge enclosed is now the sum of the two charges , hence the net q enclosed is ( -2x 10-6 ), use this in the eq and find E.

7 years ago

Post Your Answer

Other Related Questions on Electrostatics

ANALYTICALLY THe composition of two of same period and paralllel to eachother. fin the resulatnt amplitude when phase difference is:- 1) 0, 2)pie/2
For supeimpostion of any two shms the resylatnt amplitude is given as: Anet = root(a1^2 + a2^2 + 2a1a2cos(phi) where phi is the phase difference. Hence, Anet = root(a1^2 + a2^2 + 2a1*a2)...
Vikas TU 3 days ago
You r given identical resistance each of value R=10 $r capable of carry ing maximum current 1a it is required to make a suitable combination of these resistance to produce a resistance of 5...
the magnetic field is directed along west to east and a conductor is placed in it along north(x) to south(y).Find direction of induced current if any in the following cases: 1.conductor...
rishav one month ago
I believe its eight. Two resistances are connected in series . Four such connections are made and connected in parallel. Thus the equivalent resistance is 5 . If 20V is supplied then...
rishav one month ago
A Ball is thrown verticall upward with a velocity ‘u’ from the balloon descending with a constant velocity ‘v’. The ball will pass by the balloon after time ?
Dear Ranjeet Kumar, How can you Take Displacement of ball be “vt” . It should be “vt+1/2gt 2 . Its right Answer is 2(u+v)/g. I know the answer. But dont know how to solve.
Kuldeep Pal one month ago
The question needs the basic understanding of motion to solve it. considering the downward direction to be +ve and taking ground as the reference point, we have : initial velocity of ball...
RANJEET KUMAR one month ago
Dear Kuldeep, the velocity u of the ball must be with respect to the balloon. Then, taking the upward direction as positive we have: Initial velocity of the ball = u Constant velocity of...
Raman Mishra one month ago
View all Questions »

  • Complete Physics Course - Class 12
  • OFFERED PRICE: R 2,600
  • View Details
Get extra R 650 off

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details

Get extra R 700 off

More Questions On Electrostatics

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details