JEE Main 2017PhysicsElectrostaticsMediumMCQ

JEE Main 2017 — Electrostatics Question with Solution

JEE Main 2017 (08 Apr Online)

Question

The energy stored in the electric field produced by a metal sphere is 4.5 J. If the sphere contains 4 μC charge, its radius will be: Take:14π∈0=9×109 N m2 C-2

Choose an option

Show full solutionCorrect option: B
Correct answer
B16 mm

Step-by-step explanation

Energy of sphere =Q22C

4.5=16×10-122C

C=16×10-129=4πε0R

R=16×10-129×14πε0

R=16×10-129×14πε0

=9×109×169×10-12

=16×10-3=16 mm

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About this question

This is a previous-year question from JEE Main 2017, covering the Electrostatics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.