The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor $K $ will be
$K$
$2K$
$4K$
$K/4$
If the number of turns and radius of cross section of the coil of a tangent galvanometer are doubled, then the reduction factor $K$ will become
Vibration magnetometer is used for comparing
The unit of reduction factor of tangent galvanometer is
Time period in vibration magnetometer will be infinity at
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are mutually perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is $4\, sec$. If one of the magnets is taken away, find the period of oscillation of the other in the same field (in $sec.$) :-