Q10,11 The following two questions will refer to the same situation. An isolated
ID: 1569951 • Letter: Q
Question
Q10,11
The following two questions will refer to the same situation. An isolated metal sphere of radius R = 0.050 m has a net negative charge of -50 mu C. If the zero of electric potential is taken to be at infinity, what is the electric potential at the surface of the sphere? (a) zero. (b) -4.5 times 10^6 V. (c) 9.0 times 10^6 V. (d) +4.5 times 10^6 V. (e) +9.0 times 10^6 V. An isolated metal sphere of radius R = 0.050 m has a net negative charge of -50 mu C. If the zero of electric potential is taken to be at infinity, what is the electric potential at the center of the sphere? (a) zero. (b) -4.5 times 10^6 V. (c) 9.0 times 10^6 V. (d) +45 times 10^6 V. (e) +9.0 times 10^6 V.Explanation / Answer
10) c) -9.0*10^-6 V
at the surface, V = k*Q/r
= 9*10^9*(-50*10^-6)/0.05
= -9.0*10^6 V
11) c) -9.0*10^6 V
In side a metal potential is same everywhere and the value is equal to the value of the potential at the surface.
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