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  4. There are two concentric conducting shells. The potential of outer shell is 10 V and that of inner shell is 15 V. If the outer shell is grounded, the potential of inner shell is

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Q. There are two concentric conducting shells. The potential of outer shell is 10 V and that of inner shell is 15 V. If the outer shell is grounded, the potential of inner shell is

Solution:

Initial potential difference $\Delta V = 15 - 10 = 5 V$
When outer shell is earthed, potential difference remains unchanged.
$v_i^{′} - 0 = 5 ⇒ v_i^{′}$ = 5 V

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