If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by 

(a) cot2θ=cot2θ1+cot2θ2

(b) tan2θ=tan2θ1-tan2θ2

(c) cot2θ=cot2θ1-tan2θ2

(d) tan2θ=tan2θ1-tan2θ2

Concept Questions :-

Earth's magnetism
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A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by 60 is W. Now the torque required to keep the magnet in this new position is

1. W3                    2. 3W

3. 3W2                4. 2W3

Concept Questions :-

Analogy between electrostatics and magnetostatics
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The magnetic susceptibility is negative for

1. paramagnetic material only

2. ferromagnetic material only

3. paramagnetic and ferromagnetic materials

4. diamagnetic material only

Concept Questions :-

Magnetic materials
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The following figures show the arrangement of bar magnet in different configurations. Each magnet has magnetic dipole moment m. Which configuration has the highest net magnetic dipole moment?
(i) (ii) (iii) (iv)


1. (i)

2. (ii)

3. (iii)

4. (iv)

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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole.It

(a) will become rigid showing no movement

(b) will stay in any position

(c) will stay in north-south direction only

(d) will stay in east-west direction only

Concept Questions :-

Magnetic field and field lines
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A magnetic needle suspended parallel to a 

magnetic field requires 3 J of work to turn

it through 60°. The torque needed to maintain 

the needle in this position will be

(a) 23J                      (b) 3 J

(c) 3 J                       (d) 32 J

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There are four light-weight-rod samples; A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:

(i) A is feebly repelled 

(ii) B is feebly attracted

(iii) C is strongly attracted

(iv) D remains unaffected

Which one of the following is true?

1. C is of a diamagnetic material

2. D is of a ferromagnetic material

3. A is of a non-magnetic material

4. B is of a paramagnetic material

Concept Questions :-

Magnetic materials
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A short bar magnet of magnetic moment 0.4 JT-1 is placed in a uniform magnetic field of 0.16 T. The magnet is stable equilibrium when the potential energy is

(a) -0.64 J                                         (b) zero

(c) -0.082 J                                        (d) -0.064 J

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A vibration magnetometer placed in a magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2s in earth's horizontal magnetic field of 24 μT. When a horizontal field is 18 μT is produced opposite to the earth's field by placing a current-carrying wire, the new time period of the magnet will be

 

(a) 1s          (b) 2s

(c) 3s          (d) 4s

Concept Questions :-

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 Electromagnets are made of soft iron because soft iron has :

(a) low retentivity and high coercive force

(b) high retentivity and high coercive force

(c) low retentivity and low coercive force

(d) high retentivity and low coercive force

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