# A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay  1.  in horizontal direction only  2.  in vertical direction only  3.  in any direction except vertical and horizontal  4.  in any direction it is released

Subtopic:  Earth's Magnetism |
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Which of the following four graphs may best represent the current-deflection relation in a tangent galvanometer?

1. a
2. b
3. c
4. d

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A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled, the deflection will

1.  increase

2.  decrease

3.  remain unchanged

4.  either increase or decrease.

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Pick the correct options.

(a) Magnetic field is produced by electric charges only.

(b) Magnetic poles are only mathematical assumptions having no real existence.

(c) A north pole is equivalent to a clockwise current and a south pole is equivalent to an anticlockwise current.

(d) A bar magnet is equivalent to a long, straight current

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3. (c) , (d)

4. (a) , (d)

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A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole S and a north pole N.

(a) The line SN should be along a diameter of the loop.

(b) The line SN should be perpendicular to the plane of the loop.

(c) The south pole should be below the loop.

(d) The north pole should be below the loop

Choose the correct option

1.  (a) , (b)

2. (b) , (d)

3. (c) , (d)

4. (a) , (d)

Subtopic:  Bar Magnet |
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Consider a magnetic dipole kept in the north-south direction. Let P1, P2 Q1, Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same at

(a) P1 and P2

(b) Q1 and Q

(c) P1 and Q1

(d) P2 and Q2

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3. (c) , (d)

4. (a) , (d)

Subtopic:  Bar Magnet |
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Consider the situation of the previous problem. The directions of the magnetic field due to the dipole are opposite at

(a) P1 and P2

(b) Q1 and Q2

(c) P1 and Q1

(d) P2 and Q2

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3. (c) , (d)

4. (a) , (d)

Previous problem: Consider a magnetic dipole kept in the north-south direction. Let P1, P2 Q1, Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively.

Subtopic:  Bar Magnet |
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To measure the magnetic moment of a bar magnet, one may use

(a) a tangent galvanometer

(b) a deflection galvanometer if the earth’s horizontal field is known

(c) an oscillation magnetometer if the earth’s horizontal field is known

(d) both deflection and oscillation magnetometer if the earth’s horizontal field is not known

Choose the correct option

1.  (a) , (b) , (c)

2. (b) , (c) , (d)

3. (c) , (d) , (a)

4. (a) , (d) , (b)

Subtopic:  Bar Magnet |

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A paramagnetic material is placed in a magnetic field. Consider the following statements:

(A) If the magnetic field is increased, the magnetization is increased.

(B) If the temperature is increased, the magnetization is increased.

1.  Both A and B are true

2.  A is true but B is false

3.  B is true but A is false

4.  Both A and B are false

Subtopic:  Magnetic Materials |
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A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization

1. will increase

2. decrease

3. remain constant

4. may increase or decrease

Subtopic:  Magnetic Materials |
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