alleryStart learning →A wire bent into a circle of radius 10 cm carries 250 microcoulomb uniformly. What is the potential at the centre?
A2.25 x 10^7 V
B2.25 x 10^6 V
C2.25 x 10^8 V
D9 x 10^6 V
Answer & Solution
Correct answer: A. 2.25 x 10^7 V
Every element is 0.1 m from the centre, so V = 9e9 x 250e-6 / 0.1 = 2.25e7 V.
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