A magnetic needle is made to vibrate in uniform field $H$, then its time period is $T$. If it vibrates in the field of intensity $4H, $ its time period will be
$2T$
$T/2$
$2/T$
$T$
When $2 $ $amperes$ current is passed through a tangent galvanometer, it gives a deflection of $30^o$. For $60^o$ deflection, the current must be........$amp$
Which curve may best represent the current deflection in a tangent galvanometer
The sensitivity of a tangent galvanometer is increased if
To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because
A bar magnet $A$ of magnetic moment $M_A$ is found to oscillate at a frequency twice that of magnet $B$ of magnetic moment $M_B$ when placed in a vibrating magneto-meter. We may say that