Question

A uniform electric field and a uniform magnetic fields are produced, pointed in the same
direction. An electron is projected with it's velocity pointing in the same direction
1) the electron will turn to its right
2) the electron will turn to its left
3) The electron velocity will increase in magnitude
4) the electron velocity will decreases in magnitude
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Answer 1

Answer:

Explanation:

An electron is projected with its velocity pointed in the same direction. What will be the effect on electron? Solution : The electron velocity will decrease as it will experience force due to electric field opposite to the direction of electric field but no force will be acting on electron due to magnetic field.

Answer 2

Answer:

We know that the magnetic force depends on the cross product of the velocity and the magnetic field vector, and because here the velocity and the magnetic field are in the same direction as they're parallel, the magnetic force will be zero,

however, the electric field will apply a force in the direction opposite to the given velocity, as the particle is an electron, hence it'll decelerate and hence it's velocity will keep on decreasing till it becomes zero.

Hence, option (4) is correct here.