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Q.

A conducting spherical shell is earthed, A positive charge +q1 is placed at the center and another small positive charge +q2 is placed at a distance r from q1 (as shown in the figure). Ignore the effect of induced charge due to q2 on the sphere. Then the coulomb force on q2 is 
 

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a

q1q24πε0(r−R)2

b

q1q24πε0r2

c

q1q24πε0r2−R2

d

Zero

answer is A.

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Detailed Solution

As the sphere is grounded, the charge on the inner surface will be -q1 and the charge on the outer surface will be zero

There is no charge on the outer surface. Hence, no force on q2 (figure).Question Image

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