Question

Two point charges one of +100uc and another of -400uc are kept 30cm apart find the point of zero potential in the line joining the two charges (assume the potential at infinity to be zero

Answer 1

Answer:

Dipole moment (p)=q.d=(6×10

−3

).0.1=6×10

−4

Cm

Torque(τ)=p×E=pEsinθ=6

3

Nm

⇒(6×10

−4

)×E×sin30

0

=6

3

⇒E=2

3

×10

4

N/C

Now, Potential Energy =

p

.

E

=pEcosθ=(6×10

−4

)×(2

3

×10

4

)×cos60

0

=18J