Question:
Concentric equipotential surfaces due to a charged body placed at the centre, have their respective potentials 10 V ,20 V ,30 V ,40 V.Identify the polarity of charge.
Answer:
The electric potential due to a point charge at the centre,at distance r from the the charge is-
V= 1/4πεo .(q/r)
r is radius of concentric circle and q is the charge at centre.
In question all the potentials are positive so, the charge at the centre of circle has positive polarity.
Because in the above formula of potential if we put (-q),we get the negative values of potentials.
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