When a current in a circular loop is equivalently replaced by a magnetic dipole:

1.	the pole strength \(m\) of each pole is fixed
2.	the distance \(d\) between the poles is fixed
3.	the product \(md\) is fixed
4.	none of the above

Let r be the distance of a point on the axis of a bar magnet from its centre. The magnetic field at such a point is proportional to

1.   \(1 \over r\)

2.    \(1 \over r^2\)

3.     \(1 \over r^3\)

4.   none of these

Let \(r\) be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to:
1. \(\dfrac 1 r\)
2. \(\dfrac 1 {r^2}\)
3. \(\dfrac 1 {r^3}\)
4. none of these

1. \(\frac{\mu_{\mathrm{0}}}{4 \pi} \frac{\mathrm{M}}{\mathrm{d}^{3}}\)
2. \(\frac{\mu_{0}}{4 \pi} \frac{\sqrt{2} \mathrm{M}}{\mathrm{d}^{3}}\)
3. \(\frac{\mu_{0}}{4 \pi} \frac{2\sqrt{2} \mathrm{M}}{\mathrm{d}^{3}}\)
4. \(\frac{\mu_{\mathrm{0}}}{4 \pi} \frac{\mathrm{2M}}{\mathrm{d}^{3}}\)

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

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. 

Consider the following statements:

Choose the correct option from the given ones:

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 \(N.\)

Choose the correct option from the given ones:
1. (a) and (b) only
2. (b) and (d) only
3. (c) and (d) only
4. (a) and (d) only

Choose the correct option: 
1. (a), (b) 
2. (b), (c) 
3. (c), (d) 
4. (a), (d) 

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.