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As per this diagram a point charge +q is...

As per this diagram a point charge `+q` is placed at the origin `O`. Work done in taking another point charge `-Q` from the point `A(0, a)` to another point `B(a, 0)` along the staight path `AB` is:

A

`((-qQ)/(4pi epsilon_(0))(1)/(a^(2)))sqrt(2a)`

B

zero

C

`((qQ)/(4pi epsilon_(0))(1)/(a^(2)))(1)/sqrt(2)`

D

`((qQ)/(4pi epsilon_(0))(1)/(a^(2)))(1)/sqrt(2a)`

Text Solution

Verified by Experts

The correct Answer is:
B
Change moves `_|_^(r )` to the filed lines. So the work done will be zero.
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Knowledge Check

  • As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -q from the point A[co-ordinates (0,a)] to another point B[co-ordiantes (a,0)] along the straight path AB is

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    zero
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