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  • Choose the only correct choice out of the four choices (1), (2), (3) and (4) given after the following three statements. I. The magnetic field lines due to a current carrying wire radiate aw

Choose the only correct choice out of the four choices (1), (2), (3) and (4) given after the following three statements.
I. The magnetic field lines due to a current carrying wire radiate away from the wire.
II. The kinetic energy of a charged particle can be increased by a magnetic field.
III. A charged particle can move through a region containing only magnetic field without feeling any force.

Option: 1

Only Statement I is true.


Option: 2

Statements II and II are both true.


Option: 3

Statements II and III are both true.


Option: 4

Only Statement III is true.


Answers (1)

best_answer

Statement I is false. The magnetic field lines due to a current carrying wires encircle the wire in closed loops. Statement II is also false because the magnetic force {F is always perpendicular to the velocity \mathrm{\boldsymbol{v}} of the particle. Therefore power ( and hence work done) \mathrm{=\overrightarrow{\mathbf{F}} \cdot \overrightarrow{v}=0}. Since no work is done by the magnetic force, the kinetic energy of the particle cannot change. Statement III is true. Magnetic force is zero if v parallel or antiparallel to B. So the only correct choice is (4).

Posted by

HARSH KANKARIA

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