Uniform and fields are oriented at right angles to each ot

Uniform ? and ? fields are oriented at right angles to each other. An electron movers with a speed of 8

Solution

11)

Force on electron of charge q

Due Electric Field E(KV/m) F1= qE

Due to Magnetic Field (B) F2 =q v x B

                                                    =qvB    [as velocity v is perpendicular to B]

The charge electrons is undeflected because force due to Electric Field E cancels the force due to Magnetic Field B.

F1=F2

qE=qvB

E=vB =8*10⁶ x 0.5*10^-3 V/m

E=4*10³ V/m=4 KV/m [answer]

12)

As we know

F1=F2

qE=qvB

E=vB

Above derived expression is independent of mass as well as charge ,so we can say this phenomenon depends neither on charge of particle nor on mass of particle.It only depends on Electric field ,velocity of particle & Magnetic field exerted.

Note:The particle used here should have some charge .It should not be neutral.

Option(d) answer