Question

a uniform electric and magnetic field produced. In the same direction and electron when projected with velocity pointed in the same direction will
(a)turn to its right
(b)turn to its left
(c)gain the velocity
(d)loose the velocity ​

Answer 1

loss the velocity.. is the correct answer

Answer 2

hala mate,

A particle of charge q moving with velocity v in the presence of an electric field E and a magnetic field B experiences a force

F = q.E + q (v x B)

Both the fields can act on the charged electron ;

the force experienced by electron due to electric field will be = (charge). E

where E is the field strength of electric field.

and the force by the magnetic field { charge .(v X B)}

as the electron’s charge is negative the electric field will produce retardation on the electron  and the cross product in the effect of magnetic field vxB will yield zero effect as the angle between the two vectors is zero and a cross product gives a factor of sine of the angle between them.

therefore the electron will move on with reduced velocity as time advances and ultimately stop. and the magnetic field will not produce any effect whatsoever.

hope it helps!