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Question

A positively charged ball hangs from a long silk thread. The electric field at a certain point (at the same horizontal level of ball) due to this charge is E. Let us put a positive test charge q0 at this point and measure F/q0 on this charge. Then, E

A
E>F/q0
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B
E<F/q0
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C
E=F/q0
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D
None of these
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Solution

The correct option is A E>F/q0
E=kQr2....(i)
F=kQq0r21Fq0=kQr21...(ii)
As r1>r so equations (i) and (ii) we get E>F/q0
1662963_1290436_ans_3510b6459b9a4a76b4b6fc0af4b56020.png

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