A positively charged ball hangs from a long silk thread. 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,
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 AE>F/q0 E=kQr2
F=kQq0r21orFq0=kQr21 (ii)
As r1>r, so from equation (i) and (ii), we get E>F/q0