In a region of space both electric and magnetic fields exist. A charge particle is fired in that field and it passes unaccelerated. Then

# In a region of space both electric and magnetic fields exist. A charge particle is fired in that field and it passes unaccelerated. Then

1. A

are parallel

2. B

are mutually perpendicular

3. C

are mutually perpendicular and velocity of projection  must be perpendicular to both  and B = EV

4. D

If velocity of projection is  then $\stackrel{\to }{\mathrm{E}}$$\stackrel{\to }{\mathrm{B}}$ and must be mutually perpendicular and E = BV

Register to Get Free Mock Test and Study Material

+91

Verify OTP Code (required)

### Solution:

Lorentz force

Since acceleration is zero,

From the equation it is evident that $\stackrel{\to }{\mathrm{E}}$$\stackrel{\to }{\mathrm{B}}$ and $\stackrel{\to }{\mathrm{V}}$ are mutually perpendicular.

Register to Get Free Mock Test and Study Material

+91

Verify OTP Code (required)