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Two concentric spherical shell's of radius R_{1} & R_{2} have q_{1} & q_{2} charge respectively as shown in figure. How much charge will flow through key k when it is closed :-

Two concentric spherical shell's of radius R

_{1}& R_{2}have q_{1}& q_{2}charge respectively as shown in figure. How much charge will flow through key k when it is closed :-### Asked by devanshmalhotra2609 | 9th Jan, 2016, 11:05: PM

Expert Answer:

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Two concentric spherical shell of radius R_{1}_{ }& R_{2} have q_{1} & q_{2} charge respectively.(where, R_{2} > R_{1})
Now, the inner shell is grounded which implies that the inner shell will come at zero potential.
From the given figure, when key is closed and object is grounded it potential reduced to zero.
q_{1} induces -q_{1} on the inner surface of outer sphere and +q_{1} on outer surface of outer sphere
Potential of inner sphere = Potential due to charge on inner surface + Potential due charge on outer surface = 0
Hence, Correct option is 3
The Concept of concentric shell is well explained in NCERT Text book Class XII part I page no. 39 and 40.
If you have any conceptual doubts in it, we will glad to clear it.

Two concentric spherical shell of radius R

_{1}_{ }& R_{2}have q_{1}& q_{2}charge respectively.(where, R_{2}> R_{1})Now, the inner shell is grounded which implies that the inner shell will come at zero potential.

From the given figure, when key is closed and object is grounded it potential reduced to zero.

q

_{1}induces -q_{1}on the inner surface of outer sphere and +q_{1}on outer surface of outer spherePotential of inner sphere = Potential due to charge on inner surface + Potential due charge on outer surface = 0

### Answered by Priyanka Kumbhar | 12th Jan, 2016, 11:44: AM

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