Incomplete question as we have not told to find what quantity.The complete question is here
A spherical capacitor contains a charge of 3.50 nC when connected to a potential difference of 210.0 V. Its plates are separated by vacuum and the inner radius of the outer shell is 5.00 cm.calculate: (a) the capacitance; (b) the radius of the inner sphere; (c) the electric field just outside the surface of the inner sphere.
Answer:
(a) 
(b) 
(c)
Explanation:
Given data

For part (a)
The Capacitance given by:

For part (b)
The Capacitance of coordinates is given as

For part (c)
The electric field according to Gauss Law is given by:

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