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Balanced and Unbalanced Forces

Why magnetic ...

Question

Why magnetic lorentz force cannot change the kinetic energy and speed of the particle but changes its velocity and momentum?

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A charged particle moves through a region of magnetic field pointing in the direction perpendicular to its direction of velocity. Then during its subsequent motion,

(1)	Its momentum changes but the kinetic energy remains constant.
(2)	Its momentum and kinetic energy both changes.
(3)	Its momentum and kinetic energy both remains constant.
(4)	Its kinetic energy changes but the momentum remains constant.

Q. When a proton moves in a uniform magnetic field, the momentum change but its kinetic energy does not change because :

Q. A charged particle enters a uniform magnetic field perpendicular to the direction of magnetic field. How will its kinetic energy and momentum change?

Q. Assertion :The rate of change of total momentum of a many particle system is proportional to the sum of the internal forces of the system. Reason: Intrnal forces can change the kinetic energy but not the momentum of the system

Q. Assertion :Internal forces cannot change linear momentum. Reason: Internal forces can change the kinetic energy of a system.

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Balanced and Unbalanced Forces

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