# IIT JEE, AIEEE,AIPMT TEST---VIBRATION ND TANGENT GALVANOMETER

Using a bar magnet P, a vibration magnetometer has time period 2sonds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true?
Q is of non-magnetic material
Q is a bar magnet identical to P, and its north pole placed on top of P's north pole
Q is of unmagnified ferromagnetic material
Nothing can be said about Q's properties
To measure which of the following, is a tangent galvanometer used?
Charge
Angle
Current
Magnetic intensity
The period of oscillations of a magnetic needle in a magnetic field is 1.0 s. If the length of the needle is halved by cutting it, the time period is ____.
1.0 s
0.5 s
0.25 s
2.0 s
The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which one of the following happens?
Period decreases
Period does not change
Oscillations are damped
Amplitude increases
The period of oscillation of a vibration magnetometer depends on which of the following factors? where I is the moment of inertia of the magnet about the axis of suspension, M is the magnetic moment of the magnet and H is the external magnetic field
I and M only
M and H only
I and H only
I, M and H only
The magnetic needle of a tangent galvanometer is deflected at an angle 30o due to a magnet. The horizontal component of earth’s magnetic field 0.34 ( 10–4 T is along the plane of the coil. The magnetic intensity is ____.
1.96 ( 10–4 T
1.96 ( 10–5 T
1.96 ( 104 T
1.96 ( 105 T
The time period of a bar magnet suspended horizontally in the earth's magnetic field and allowed to oscillate ____.
Is directly proportional to the square root of its mass
Is directly proportional to its pole strength
Is inversely proportional to its magnetic moment
Decreases if the length increases but pole strength remains same
A bar magnet has a magnetic moment equal to It is suspended in a magnetic field which has a magnetic induction (B) equal to  The magnet vibrates with a period of vibration equal to 15 s. The moment of inertia of the magnet is ____.
The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period is ____.
4 s
2 s
0.5 s
0.25 s
The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor K is ____.
K
2K
4K
K/4
A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500°C, then ____.
The time period decreases
The time period remains unchanged
The time period increases
The needle stops vibrating
Description:

Questions are from vibration and tangent galvanometer--mostly numericals . It contains interesting questions like what happens to the time period of a suspended magnetic needle when its temperature is increased

Discussion
Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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