Question

The magnitude of the earth's magnetic field at the north pole is $B_0$. A horizontal conductor of length $l$ moves with a velocity $v$. The direction of $v$ is perpendicular to the conductor. The induced emf is

• A. zero, if $v$ is vertical
• B. $B_{0}lv$, if $v$ is vertical
• C. zero, if $v$f is horizontal
• D. $B_{0}lv$, if $v$ is horizontal
• E. answer required

Answer 1

Answer: (A), (D)

The correct options are
A zero, if $v$ is vertical
D $B_{0}lv$, if $v$ is horizontal

$E=l\overrightarrow{v}\times \overrightarrow{B}$
If $v$ and $B$ are in the same direction, the induced EMF is zero
At poles magnetic field is in vertical direction
$E=0$, if v is vertical
$E=B_{o}lv$, if v is horizontal