The slotting processes in a metallic sheet results in:

1.	The increase of the resistance in the path for circulation of current.
2.	Decrease in the strength of eddy current.
3.	A feeble in the electromagnetic damping.
4.	All of these

The square loop shown below is rotated about the axis PQ and magnetic field is perpendicular to the plane of the paper. The magnitude of induced emf in the loop is minimum when the plane of the loop:

1. is perpendicular to the plane of the paper.

2. is parallel to the plane of the paper.

3. makes 45$°$ angle with the plane of the paper.

4. makes 60$°$ angle with the plane of the paper.

A small square-shaped loop of edge length l is placed at the centre of a circular loop A of radius r with its plane perpendicular to the plane of the circular loop. The coefficient of mutual induction of this combination is 

1. Zero

2. $\frac{{\mu }_0\sqrt{2}l{r}^2}{3\pi }$

3. $\frac{{\mu }_0\sqrt{2}{l}^{2}r}{3}$

4. $\frac{{\mu }_0\sqrt{3}{l}^2}{2r}$

A horizontal ring of radius r spins about its vertical axis with an angular velocity $\omega$ in a uniform vertical magnetic field of magnitude B. The emf induced in the ring is

1. Zero

2. $\pi r^{2}B\omega$

3. $\frac{1}{2}B\omega r^2$

4. $B\omega r^2$

If N is the total number of turns in a coil, then the value of self-inductance varies as

1. N$°$

2. N

3. N²

4. $\sqrt{N}$

Eddy currents are produced in a material when it is:
 

Lenz's law associated with Faraday's laws of electromagnetic induction are consequence of the conservation of

1. Charge

2. Energy

3. Magnetic field

4. Mass

Self inductances of two uncoupled coils are 40 mH and 90mH. Their mutual inductance is

1. 60 mH

2. 130 mH

3. 50 mH

4. Zero

Magnetic flux through a circuit of resistance \(20~\Omega\) is changed from \(20\) Wb to \(40\) Wb in \(5\) ms. The charge passed through the circuit during this time is:
1. \(1\) C
2. \(2\) C
3. zero
4. \(0.5\) C

A long straight conductor, carrying current I, is fixed on a smooth plane. A circular loop is placed on the same plane as shown in the figure. If the current I through the wire is increasing, then the loop will move towards:

1. Right

2. Left

3. Up 

4. Down