Question

A charged particles is projected at angle theta in uniform magnetic field with speed v ,after time t the speed will be​

Answer 1

Answer:

A charged particle enters into a uniform magnetic field with velocity vector at angel of 45 ° with the magnetic field. the pitch of the helical path followed by the particle is P . the radius of helix see the image and the radius of helix is that image .

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

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