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JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES
1
Medium
1 of 1
Understanding
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Assertion(A): In an uniform magnetic field,
speed and kinetic energy remains the same
for a moving charged particle.
Reason (R): In the case of motion of a charge
in a magnetic field, the magnetic force is
perpendicular to the velocity of the particle.
So, no work is done and no change in the
magnitude of the velocity (speed) and
kinetic energy is produced.
speed and kinetic energy remains the same
for a moving charged particle.
Reason (R): In the case of motion of a charge
in a magnetic field, the magnetic force is
perpendicular to the velocity of the particle.
So, no work is done and no change in the
magnitude of the velocity (speed) and
kinetic energy is produced.
View answer and explanation
Correct option: A
Both A and R are true and R is the
correct explanation of A
correct explanation of A
Option A is correct because the magnetic force on a moving charged particle in a uniform magnetic field is perpendicular to its velocity, resulting in no work done and constant speed and kinetic energy.
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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 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 is acting between two charges in air if the space between them is completely filled with glass , then the new force will be …… An electron is placed at centre of a conducting sphere of radius 0.2 metre having charge coulomb. The force of on the electron is ________ N