Electromagnetic Induction — Physics STD 12 Science — Question

What is a capacitive and an inductive AC circuit? Explain.

Two identical circular loops, P and Q. each of radius r and carrying currents are kept in the parallel planes having a common axis passing through O. The direction of current in P is clockwise and in Q is anti-clockwise as seen from O which is equidistant from the loops P and Q. Find the magnitude of the net magnetic field at O.

A load of 10kg is suspended by a metal wire 3m long and having a cross-sectional area 4mm². Find.

1. The stress.
2. The strain and.
3. The elongation. Young's modulus of the metal is 2.0 × 10N¹¹N/ m².

A slab of material of dielectric constant K has the same area as that of the plates of a parallel plate capacitor but has the thickness d/2, where d is the separation between the plates. Find out the expression for its capacitance when the slab is inserted between the plates of the capacitor.

An electron is not deflected while passing through any field. Is it possible that there is no magnetic field present at that place? Explain.

Calculate the torque on the square plate of the previous problem if it rotates about a diagonal with the same angular acceleration.

What are the (a) momentum, (b) de-Broglie wavelength of an electron with kinetic energy of 120 eV. ? Find.

"Monochromatic light should be used to produce pure spectrum". Comment on this statement.

Light of wavelength 560nm goes through a pinhole of diameter 0.20mm and falls on a wall at a distance of 2.00m. What will be the radius of the central bright spot formed on the wall?