Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 19

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Assertion: At the centre of a circular current carrying loop $I_{1}$ , there is an infinitely long straight current carrying wire $I_{2}$ perpendicular to the plane of the circle. Then, magnetic force of attraction between two is zero.

Reason: Magnetic field of $I_{1}$ at centre is inwards, parallel to $I_{2}$ .

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Important Questions on Magnetic Effects of Current

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 20

Assertion: If the velocity of charged particle in a uniform magnetic field at some instant is, $(a_{1} \hat{i} - a_{2} \hat{j})$ and at some other instant is $(b_{1} \hat{i} + b_{2} \hat{j})$ , then $a_{1}^{2} + a_{2}^{2} = b_{1}^{2} + b_{2}^{2}$ .

Reason: Magnetic force cannot change velocity of a charged particle.