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A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth’s magnetic field at A is $36 \times {10^{ - 6}}T,$ then its value at B is
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
Which of the following statement is not the true
The period of oscillations of a magnet is 2 sec. When it is remagnetised so that the pole strength is 4 times its period will be
When two magnetic moments are compared using equal distance method the deflections produced are $45^o$ and $30^o$. If the length of magnets are in the ratio $1 : 2$, the ratio of their pole strengths is
The magnetic needle of a tangent galvanometer is deflected at an angle $30^o$ due to a magnet. The horizontal component of earth’s magnetic field $0.34 \times 10^{–4} T$ is along the plane of the coil. The magnetic intensity is
In a tangent galvanometer a current of $0.1 A$ produces a deflection of $30^o$. The current required to produce a deflection of $60^o$ is
A bar magnet is oscillating in the Earth’s magnetic field with a period T. What happens to its period and motion if its mass is quadrupled
A thin rectangular magnet suspended freely has a period of oscillation equal to $T$. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is $T'$, then ratio $\frac{{T'}}{T}$is
A bar magnet is oscillating in the earth's magnetic field with time period T. If its mass is increased four times then its time period will be

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