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Electrostatics question

2020 · 5 Sep · Shift 2 · Q50
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  5. /2020 · 5 Sep · Shift 2 · Q50

Electrostatics question

2020 · 5 Sep · Shift 2 · Q50

JEE MainPhysicsElectrostaticsMCQ+4 / −1
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)
  1. A
    V = 0; E = 0
  2. B
    V=10q4πε0RV = {{10q} \over {4\pi {\varepsilon _0}R}}V=4πε0​R10q​; E=10q4πε0R2E = {{10q} \over {4\pi {\varepsilon _0}{R^2}}}E=4πε0​R210q​
  3. C
    V=10q4πε0RV = {{10q} \over {4\pi {\varepsilon _0}R}}V=4πε0​R10q​; E = 0
  4. D
    V = 0; E=10q4πε0R2E = {{10q} \over {4\pi {\varepsilon _0}{R^2}}}E=4πε0​R210q​
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