JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius

r.

The coulomb force

{\vec F}

between the two is 

View answer and explanation

Correct option: C

- K\frac{{{e^2}}}{{{r^3}}}\vec r

Option C (

- K\frac{{{e^2}}}{{{r^3}}}\vec r

) is correct because the Coulomb force is attractive (negative sign) and inversely proportional to the square of the distance, expressed in vector form.

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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

Statement-II: tangent at any point of electric line of force gives the direction of electric field A force of

4N

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