The work done to complete one revolution in a circle of radius r by a charge Q, if a charge Q is placed at the centre of the circle will be

Question

The work done to complete one revolution in a circle of radius r by a charge Q, if a charge Q is placed at the centre of the circle will be (A)  (Q/4π ε 0r)  (B)  (Q2al/4π ε 0r)  (C) zero (D)  (Qal/2r)

Tardigrade Admin · Accepted Answer

There will be same potential on all the points of the charged circle and hence work done by charge in moving on circular path will be zero.

Q. The work done to complete one revolution in a circle of radius r by a charge Q, if a charge Q is placed at the centre of the circle will be

$\frac{Q}{4 π ε _{0} r}$

$\frac{Q ^{2} a l}{4 π ε _{0} r}$

zero

$\frac{Q a l}{2 r}$

There will be same potential on all the points of the charged circle and hence work done by charge in moving on circular path will be zero.

Q. The work done to complete one revolution in a circle of radius r by a charge Q, if a charge Q is placed at the centre of the circle will be

4πε0​rQ​

4πε0​rQ2al​

zero

2rQal​

There will be same potential on all the points of the charged circle and hence work done by charge in moving on circular path will be zero.

$\frac{Q}{4 π ε _{0} r}$

$\frac{Q ^{2} a l}{4 π ε _{0} r}$

$\frac{Q a l}{2 r}$