A) 7 cm
B) 6 cm
C) 5 cm
D) 4 cm
Correct Answer: B
Solution :
Suppose the radius of the sphere before charge is x. Then, \[4\pi {{(x+2)}^{2}}-4\pi {{x}^{2}}=352\] \[4\pi [{{x}^{2}}+4+4x-{{x}^{2}}]=352\] \[4x+4=\frac{352\times 7}{4\times 22}\] \[4x+4=28\] \[4x=24\] \[x=6\,\,cm\]You need to login to perform this action.
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