JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

A charge Q is distributed over three concentric spherical shells of radii a, b, c (a < b < c ) such that their surface charge densities are equal to one another. The total potential at a point at distance r from their common centre, where r < a, would be.

A
$\frac{Q}{4 π ε _{0} ( a + b + c )}$
B
$\frac{Q ( a + b + c )}{4 π ε _{0} ( a ^{2} + b ^{2} + c ^{2} )}$
C
$\frac{Q}{12 π ε _{0}} \frac{ab + b c + c a}{ab c}$
D
$\frac{Q}{4 π ε _{0}} \frac{( a ^{2} + b ^{2} + c ^{2} )}{( a ^{3} + b ^{3} + c ^{3} )}$

Solution

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