Magnetism and Matter — Physics STD 12 Science — Question

If the speed of a rod moving at a relativistic speed parallel to its length is doubled,

1. The length will become half of the original value.
2. Mass will become double of the original value.
3. The length will decrease.
4. The mass will increase.

A car travels at a speed of 60km/hr due north and the other at a speed of 60km/hr due east. Are the velocities equal? If no, which one is greater? If you find any of the questions irrelevant, explain.

The springs shown in the figure are all unstretched in the beginning when a man starts pulling the block. The man exerts a constant force F on the block. Find the amplitude and the frequency of the motion of the block.
 

The dielectric constant decreases if the temperature is increased. Explain this in terms of polarization of the material.

State which of the two, the capacitor or an inductor, tends to become a SHORT when the frequency of the applied alternating voltage has a very high value.

Write the relation for the speed of electromagnetic waves in terms of the amplitudes of electric and magnetic fields.

Equal currents are flowing through two infinitely long parallel wires. What will be the magnetic field at a point midway when the currents are flowing in the same direction?

Light passes through a closed cylindrical tube containing a gas. If the gas is gradually pumped out, the speed of light inside the tube will:

1. Increase.
2. Decrease.
3. Remain constant.
4. First increase and then decrease.

Answer the following questions:
Why is diamagnetism, in contrast, almost independent of temperature?