NEET 2018 — Paper 2018 — Physics solution

NEET2018Paper 2018Physics

An em wave is propagating in a medium with a velocity $V = V \hat{i} .$ The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

A
–z direction
B
–y direction
C
+z direction
D
–x direction

Solution

$E \times B = V$

$(E \hat{j}) \times (B) = V \hat{i}$

$So, B = B \hat{k}$

Direction of propagation is along +z direction.

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