The sensitivity of a tangent galvanometer is increased if
Number of turn decreases
Number of turn increases
Field increases
None of the above
Two different magnets are tied together and allowed to vibrate in a horizontal plane. When their like poles are joined, time period of oscillation is $5 \,s$ and with unlike poles joined, time period of oscillation is $15 \,s$. The ratio of their magnetic moments is
Twists of suspension fibre should be removed in vibration magnetometer so that
Magnets $A$ and $B$ are geometrically similar but the magnetic moment of $A$ is twice that of $B$. If $T_1 $ and $T_2$ be the time periods of the oscillation when their like poles and unlike poles are kept together respectively, then $\frac{{{T_1}}}{{{T_2}}}$will be
Keeping dissimilar poles of two magnets of equal pole strength and length same side, their time period will be
Vibration magnetometer before use, should be set