Four charges +3μC,−1μC,+5μCand −7μCare arranged on the circumference of a circle of radius 0.5m. The potential at the centre is :
288×103V
Zero
18×104V
−18×104V
A
Zero
B
18×104V
C
−18×104V
D
288×103V
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Solution
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We know potential is a scalar quantity net V at center is just sum of potential due to individual V=k(3μC)r+k(−1μC)r+k(5μC)r+k(−7μC)r
V=kr(3−1+5−7)
V=0volts.
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