JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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Assertion:- An electrostatic field represent as

\vec{E}=E_x \hat{i}+E_y \hat{j}+E_z \widehat{k}

satisfies

\vec{\nabla} \times \vec{E}=0

Reason:-

E_x, E_y, E_z

are independent of each other.

View answer and explanation

Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

Option A (

{n_e}

increases and

{v_d}

decreases) is correct because increasing temperature in a semiconductor increases the number of free electrons but decreases their drift velocity due to increased collisions.

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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

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are separated by a distance

r.

The force(s) they
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4N

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

, then the new force will be ……

N

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5 \times {10^{ - 2}}

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