JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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Analyzing +4 | -1

The bob of simple pendulum is hanging vertically down from a fixed identical bob by means of string of length

l

. If both bobs are charged with a charge with a charge

q

each, time period of the pendulum is (ignore the radii of the bobs)

View answer and explanation

Correct option: C

2\pi \sqrt {\frac{l}{\mathrm{g}}}

Option C is correct because the electrostatic repulsion between the charged bobs does not affect the time period of the pendulum, which remains the same as for a simple pendulum.

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Assertion:- Electric field lines do not cut at any point.
Reason:- At any point, there is only one direction of electric field. Statement-I: A positive point charge is brought in an electric field, the electric field at neary by point will increase

Statement-II: Electric field produced by charge may favour the existing electric filed Two particles having equal mass and charge
are separated by a distance

r.

The force(s) they
experience is (are) Statement-I: No 2 electric lines of force can intersect each other

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is acting between two charges in air if the space between them is completely filled with glass

\left( {{\varepsilon _r} = 8} \right)

, then the new force will be ……

N

An electron is placed at centre of a conducting sphere of radius 0.2 metre having charge

5 \times {10^{ - 2}}

coulomb. The force of on the electron is ________ N