A uniformly charged sphere of total charge Q expands and contract between radii R1 and R2 at a frequency f. The total power radiated by the sphere is
A. proportional to Q
B. proportional to f2
C. proportional to f4
D. proportional to (R1 / R2)
E. zero
(GR0177 #96)
Solution:
Power, P = VI
I = dq / dt
Q is constant → dq = 0 → I = 0 → P = 0
Answer: E
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