Magnetism and M...

Which of the following magnetic line alignment is correct for ferrimagnetism?

The mass of a specimen of a ferromagnetic material is 0.6 kg and the density is $$7.8 \times {10^3}\;{\text{kg}}\;{{\text{m}}^{{\text{ - 3}}}}$$ . If the area of the hysteresis loop of the alternating magnetizing field of frequency 50 Hz is 0.722 MKS units, then hysteresis loss per second will be 

A coil of 50 turns and area $$1.25 \times {10^{ - 3}}{{\text{m}}^{\text{2}}}$$ is pivoted about a vertical diameter in a uniform current of the horizontal magnetic field and carries a current of 2A. When the coil is held with its plane in N-S direction, it experiences a couple of 0.04 N-m; and when its plane is E-W, the corresponding couple is 0.03 N-m. The magnetic induction is 

An electron moves on a staight line path $$XY$$ as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any,induced in the coil?

A uniform but time varying magnetic field exists in cylindrical region and directed into the appear. If field decreases with time and a positive charge placed at any point inside the region, then if moves

A coil having n turns and resistance $$R\Omega$$, is connected in series with resistance $$R$$. This combination is moved in time t seconds from a magnetic field $$W_{1}$$ weber to $$W_{2}$$ weber. The induced current in the circuit is 

Choose the correct examples for the ferro magnetic material.

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a curent of 5.2 A. The coercivity of the bar magnet is:

A small piece of metal $$\left( { \mu  }_{ r }=20 \right) $$ of volume $$10 c{ m }^{ 2 }$$ has a uniform magnetic field 4 T inside it. The magnetic energy stored in the metal is:

A conducting circular loop made of a thin wire, has area $$3.5\times 10^{ -3 }m^{ 2 }$$ and resistance 10 $$\Omega $$. It is placed perpendicular to a time dependent magnetic field B(t)=(0.4T)sin(50$$\pi $$t). The field is uniform in space. Then the net charge flowing through the loop during t=0 s and t=10 ms is close to :