Electrostatics Question 718

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

Options:

A) 7.5×107NC1

B) 7.2×107NC1

C) 6.2×107NC1

D) 6.5×107NC1

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Answer:

Correct Answer: B

Solution:

[b] Charge on the element opposite to the gap is dq=Q2πr(0.002π)

=12π(0.5)×2π1000=2×103C

E=9×109×2×103(0.5)2=7.2×107NC1



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