An isolated metal sphere of radius R, carrying an electric charge Q, is situated in...
PHYSICS
WAEC 2010
An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The electric potential at p is given by the expression
- A. \(\frac{Q}{4 \pi E_o E_r}\)
- B. \(\frac{Q}{4 \pi E_o E_r (R +r)}\)
- C. \(\frac{Q}{4 \pi E_o E_r(R - r)}\)
- D. \(\frac{Q}{4 \pi E_o E_rR}\)
Correct Answer: D. \(\frac{Q}{4 \pi E_o E_rR}\)
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