Questions
Concentric metallic hollow spheres of radii R and 4R hold charges and respectively. Given that surface charge densities of the concentric spheres are equal, the potential difference V(R) – V(4R) is :
detailed solution
Correct option is C
Surface charge densities are equal ∴Q14πR2=Q24π4R2 ⇒Q2=16Q1Potential of inner shell =kQ1R+kQ24RPotential of outer shell = kQ14R+kQ24R∴ Potential difference between shells =3kQ14R = 3Q116πε0RTalk to our academic expert!
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1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of
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