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Question

The plastic rod in the figure forms a half-circle and has charge Q uniformly distributed along its length L. Find the electric field at the origin.
597284.JPG

A
2kQπ
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B
2kQπL
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C
2kQLπ
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D
2kQ
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Solution

The correct option is B 2kQπ

Half circle and charge =Q uniformly distributed along its length =L, find the electric field
E=μ04π×QL2

=2μ0π×QL

=2kQπL

1233331_597284_ans_4f9e119f80594e82aeaeb03f147519c9.jpg

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