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Three conducting spherical shells have c...

Three conducting spherical shells have charges `q,-2q` and `3q` as shown in figure. Find electric Potential at point P as shown in figure.

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The correct Answer is:
A
Potential P, `V_P=V_q-V_(-2q)+V_(3q)`
=(kq)/r-(k(2q))/r+(k_(3q))/(3R)`
Here `=kq(1/R-1/r)`
here `k=1/(4piepsilon_0)`
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