A charged particle moves through a magne...

A charged particle moves through a magnetic field perpendicular to its direction. Then

Kinetic energy changes but the momentum is constant

the momentum changes but the kinetic energy is constant

both momentum and kinetic energy of the particle are not constant

both momentum and kinetic energy of the particle are constant

Text Solution

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The correct Answer is:

NOTE : When a charged particle enters a magnetic field at a direction perpendicuar to the direction of motion , the path of the motion is circular . In circular motion the direction of velocity changes aat every point ( the magnitude remains constant).
Therefore , the tangential momentum will change at every point. But kinetic energy will remain constant as it is given by `(1)/(2) mv^(2) and v^(2)` is the square of the magnitude of velocity which does not change.

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A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

Acceleration remain unchanged

velocity remains unchanged

speed of the particle remains unchanged

Direction of the particle remains unchanged

A charged particle moves in a uniform magnetic field perpendicular to it, with a radius of curvature 4 cm. On passing through a metallic sheet it loses half of its kinetic energy. Then, the radius of curvature of the particle is

`2 cm`

`4 cm`

`8 cm`

`2sqrt2 cm`

A charged particle enters a uniform magnetic field perpendicular to it. The magnetic field

increases the `K.E.` of the particle

decreases the `K.E.` of the particle

changes the direction of motion of the particle

does both (a) and ( c)