Home
Class 12
PHYSICS
A particle of mass m, charge q and kinet...

A particle of mass m, charge q and kinetic energy T enters in a transverse uniform magnetic field of induction B. After the 3 s, the kinetic energy of the particle will be

A

T

B

4 T

C

3 T

D

2 T

Text Solution

Verified by Experts

The correct Answer is:
A
`vecF=q(vec vxxvecB)`, i.e. magnetic force is perpendicular to both velocity and magnetic field. A force `_|__(r)`, to `vecV` does no work or no power delivered by force which is `_|__(r), vecVA` hence no kinetic energy or speed will change since
`P=vecF.vecV=0`
As `vecF _|__(r),vecV_|__(r),vec(dr)`
or `dW=vecF.vec(dr)=0`
Promotional Banner

Similar Questions

Explore conceptually related problems

A particle of mass m has momentum p. Its kinetic energy will be

Cooling decreases the kinetic energy of particles.

A particle of mass m and charge Q moving with a velocity v enters a region on uniform field of induction B Then its path in the region is s

If a charged particle enters perpendicular in the uniform magnetic field then

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released, the kinetic energy attained by the particle after moving a distance y will be

Assertion An alpha- particle and a deuteron having same kinetic energy enter in a uniform magnetic field perpendicular to the field. Then, radius of circular path of alpha- particle will be more. Reason (q)/(m) ratio of an alpha- particle is more than the (q)/(m) ratio of a deuteron.

A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E . The kinetic energy of the particle after time t is

A charge particle of mass m and charge q enters in a region of uniform magnetic field as shown in figure.The magnitude of change in linear momentum due to magnetic field will be

Two particles of masses m and 2m and charges 2q and q are placed in a uniform electric field E and allowed to move for the same time. The ratio of kinetic energies will be -

When a charged particle enters a uniform magnetic field its kinetic energy