Q.

A ring of charge with radius 0.5 m has  0.002 πm gap. If the ring carries a charge of + 1 C, the electric field at the center is nearly

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a

7.5×107NC−1

b

7.2×107NC−1

c

6.2×107NC−1

d

6.5×107NC−1

answer is B.

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Detailed Solution

Charge on the element opposite to the gap isdq=Q2πr0.002π  E=dq4πε0r2
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A ring of charge with radius 0.5 m has  0.002 πm gap. If the ring carries a charge of + 1 C, the electric field at the center is nearly