Science (English Medium) Class 12 - CBSE Question Bank Solutions for Physics

Obtain if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state.

An applied voltage signal consists of a superposition of a dc voltage and an ac voltage of high frequency. The circuit consists of an inductor and a capacitor in series. Show that the dc signal will appear across C and the ac signal across L.

Magnetic intensity is given by ______.

If `vec"H"` = magnetic intensity, `chi` = susceptibility, magnetic moment per unit volume `vec"M"` equals ______.

Alternating current is so called because _______.

In a circuit containing resistance only, voltage and current are ______.

Average power supplied to an inductor over one complete cycle is ______.

If circuit containing inductance only, the current ______.

Photoelectric effect is ______.

The difference in mass of a nucleus and its constituents is called ______.

In a pure or intrinsic semiconductor, valence band holes and conduction-band electrons are always ______.

Magnetic lines of force due to a bar magnet do not intersect because ______.

A magnetic needle of magnetic moment 6.7 × 10^–2 Am² and moment of inertia 7.5 × 10^–6 kg m² is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is ______.

One can define ...A... of a place as the vertical plane which passes through the imaginary line joining the magnetic North and the South–poles. Here, A refers to ______.