    Question

# Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1,3,5,7,9 have charge (+q) each, while 2,4,6,8,10 have charge (−q) each. The potential V and the electric field E at the centre of the circle are respectively : (Take V=0 at infinity)

A
V=10q4πε0R;E=0
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B
V=0;E=10q4πε0R2
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C
V=0;E=0
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D
V=10q4πε0R;E=10q4πε0R2
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Solution

## The correct option is C V=0;E=0Potential at the centre, Vc=KQnetR ∵Qnet=0 ∴Vc=0 Let E be electric field produced by each charge at the centre, then resultant electric field will be Ec=0, since equal electric field vectors are acting at equal angle so their resultant is equal to zero.   Suggest Corrections  0      Similar questions  Related Videos   Electric Potential Due to Continuous Charge Distribution
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