There are four concentric shells A, B, C...

There are four concentric shells A, B, C and D of radii a, 2a, 3a and 4a respectively. Shells B and D are given charges `+q` and `-q` respectively. Shell C is now earthed. The potential difference `V_A-V_C` is

`(Kq)/(2a)`

`(Kq)/(3a)`

`(Kq)/(4a)`

`(Kq)/(6a)`

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