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JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

1 Medium

1 of 1

Application +4 | -1

A free pith-ball

A

of

8 \mathrm{~g}

carries a positive charge of

5 \times 10^{-8} \mathrm{C}

. What must be the nature and magnitude of charge that should be given to a second pith-ball

B

fixed

5 \mathrm{~cm}

below the former ball so that the upper ball is stationary?

View answer and explanation

Correct option: A

4.36 \times 10^{-7} \mathrm{C}

Option A (

4.36 \times 10^{-7} \mathrm{C}

) is correct because the electrostatic force of repulsion must balance the weight of the upper pith-ball.

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