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Q.

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, E

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a

> F/q0

b

< F/q0

c

=F/q0

d

none of these

answer is A.

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Detailed Solution

E=kQr2............(i)F=kQq0r12 or Fq0=kQr12...........(ii)As r1 > r, so from Eqs. (i) and (ii), we get E > F/q0
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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, E