The angle of dip at a certain place is 30o. If the horizontal component of the earth’s magnetic field is H, the intensity of the total magnetic field is

1. H2                            2. 2H3

3. H2                         4. H3

Subtopic:  Earth's Magnetism (OLD NCERT) |
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The time period of oscillation of a freely suspended bar magnet with usual notations is given by

1. T=2πIMBH

2.  T=2πMBHI

3. T=2IMBH

4. T=2πBHMI

Subtopic:  Bar Magnet |
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Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be

1. 4T

2. T/4

3. T/2

4. T

 

Subtopic:  Bar Magnet |
 58%
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The period of oscillation of a magnet in vibration magnetometer is 2 sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is

(1) 1 sec                         

(2) 4 sec

(3) 8 sec                         

(4) 0.5 sec

Subtopic:  Bar Magnet |
 75%
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If 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:

1. \(2T\) 2. \(\dfrac{T}{2}\)
3. \(\dfrac{2}{T}\) 4. \(T\)
Subtopic:  Bar Magnet |
 79%
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A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30o and 15 oscillations per minute at a place where dip angle is 60o. The ratio of total earth's magnetic field at the two places is:

1. 33:8
2. 16:93
3. 4:9
4. 23:9

Subtopic:  Earth's Magnetism (OLD NCERT) |
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A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magnetic moment is quadrupled and the earth's field is doubled, the number of oscillations made per minute would be

1. n22                         2. n2

3. 22n                        4. 2n

Subtopic:  Bar Magnet |
 68%
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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:
1. \(\frac{1}{3}\)
2. \(\frac{1}{2}\)
3. \(\frac{1}{\sqrt{3}}\)
4. \(\sqrt{3}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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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

(1) The time period decreases

(2) The time period remains unchanged

(3) The time period increases

(4) The needle stops vibrating

Subtopic:  Bar Magnet |
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The time period of oscillation of a bar magnet suspended horizontally along the magnetic meridian is T0. If this magnet is replaced by another magnet of the same size and pole strength but with double the mass, the new time period will be

(1) T02                           

(2) T02

(3) 2T0                        

(4) 2T0

Subtopic:  Bar Magnet |
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