Question

if
$\sqrt{3}$
jouie of work is done by an externai agent
in rotating an electric dipole from the direction of
uniform electric field to direction making an angle
of 60° with it without acceleration, calculate
torque required to hold dipole in same position.​

Answer 1

Explanation:

ANSWER

We know Potential energy u=−P.E.

Now work done W=ΔU

=(−P.E cosθ

2

)−(−P.E cosθ

1

)

=(−P.E cos180)−(−P.E cosθ)

=2 P.E

2×(1×10

−6

×2×10

−2

)(10

5

)

w=4×10

−3

J