MCQ
The direction of $EM$ wave is given by
- ✓$\bar{E} \times B$
- B$\bar{E} . B$
- Calong $\bar{E}$
- Dalong $B$
✓
Answer
Correct option: A.
$\bar{E} \times B$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A person travelling in a straight line moves with a constant velocity $v_1$ for certain distance 'x' and with a constant velocity $v_2$ for next equal distance. The average velocity v is given by the relation.
→The SI unit of the emf of a cell is
$(\vec{P}+\vec{Q})$ is a unit vector along $X$-axis. If $\vec{P}=\hat{i}-\hat{j}+\hat{k}$ then $\vec{Q}$ is
→→
In a transverse wave, are regions of negative displacement.
The magnitude of scalar product of two unit vectors perpendicular to each other is
A ball of mass $M_1$ collides elastically and head on with another ball of mass $M _2$ initially at rest. In which of the following cases the transfer of momentum will be maximum?
→A body of mass 1 kg, initially at rest explodes and breaks into three parts. The masses of the parts are in the ratio 1 : 1 : 3. The two pieces of equal mass fly off perpendicular to each other with speed of 30 m/s each. The velocity of the heavier part in m/s is
A particle of mass ' $m$ ' moves along a circle of radius ' $r$ ' with constant tangential acceleration. If K.E. of the particle is ' $E$ ' by the end of third revolution after beginning of the motion, then magnitude of tangential acceleration is
→A body of mass m strikes a wall with velocity v and rebounds with the same speed. Its change in momentum is