Ten charges are placed on the|ELECTROSTATICS| JEE-MAIN 2020

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JEE-MAIN 2020

05-09-2020 S2

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)

Select the correct option:

A

V = 0; E = 0

B

$V=\frac{10 q}{4 \pi \varepsilon_0 R} ; E=\frac{10 q}{4 \pi \varepsilon_0 R^2}$

C

$V=\frac{10 q}{4 \pi \varepsilon_0 R} ; E=0$

D

$\mathrm{V}=0 ; \mathrm{E}=\frac{10 \mathrm{q}}{4 \pi \varepsilon_0 \mathrm{R}^2}$

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