Fluid Mechanics — Physics STD 12 Science — Question

Can a hot-wire ammeter be used to measure a direct current having a constant value? Do we have to change the graduations?

Write mathematical expression for Ampere- Maxwell's law.

A plane electromagnetic wave is travelling along Z-axis in vacuum. What can you say about the electric field and magnetic field vectors?

Give a reason to show that microwaves are better carriers of signals for long range transmission than radio waves.

Two proton beams going in the same direction repel each other whereas two wires carrying currents in the same direction attract each other. Explain.

A string clamped at both ends vibrates in its fundamental mode. Is there any position (except the ends) on the string which can be touched without disturbing the motion? What if the string vibrates in its first overtone?

When unpolarised light from air, passes through transparent medium, in which direction will the reflected light be polarized?

Define refraction of light.

Write the name of the electromagnetic wave that is used to study crystal structure of solids.