Question

A charge particle is projected an angle theta in uniform magnetic field with speed V. After time t it's speed will be​

Answer 1

Answer:

v

Explanation:

speed will be constant in magnetic field...

because magnetic field don't cause acceleration so velocity will be constant

Answer 2

After time t the speed will be v

Explanation:

Force on a particle with charge q moving with velocity $\vec v$ in a magnetic field $\vec B$ is given by

$\vec F=q(\vec v\times \vec B)$

As there is cross product  of the velocity and magnetic field, the force will act perpendicular to both the velocity and the magnetic field

Since, there will be no force in the direction of the velocity therefore, the velocity v will not change

Hope this answer is helpful.

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