Question

Velocity and acceleration vectors of a charged particle moving in a magnetic field at some Instant are $\bar{\nu}=3\hat{i}+4\hat{j}$ and $\bar{a}=2\hat{i}+x\hat{j}$. Select the wrong alternative

• A. x=-1.5
• B. x=3
• C. magnetic field is along z-dircctipn
• D. Kinetic energy of the particle is constant

Answer 1

Answer: (D)

Kinetic energy of the particle is constant

Answer 2

$\bar{F}.\bar{v}=0$