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qUESTIONS

An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

A 1 µF condenser is charged to 50 V. The charging battery is then disconnected and a 10 mH coil is connected across the capacitor so that LC oscillations occur. What is the maximum current in the coil ? Assume that the circuit contains no resistance. The capacity of a pure capacitor is 1 F. In d.c. circuits, its effective resistance will be

In figure, AC source of emf e = 100√2 sin 60 πt volt and ammeter reads 5 A. The value of L is:

At resonance, the peak value of current in a series L-C-R circuit is (symbols have their usual meanings):

The frequency for which a 5 µF capacitor has a reactance of 1/1000 Ω is given by

In the circuit shown, the AC source has voltage V=20 cos(ωt) volt with ω=2000 rad/s. The magnitude of amplitude of current will be nearly

The wavelength ‘λ’ of a photon and the De-Broglie wavelength of a electron have same value. The ratio of energy of a photon to kinetic energy of electron is :(m = Mass of electron, c = Velocity of light,h = Planck’s constant) [MHT-CET 2023]

A magnetising field of 300 Am-1 produces a magnetic flux density (B) = 0.3 T in a ferromagnetic material. What is its permeability in Tm A is?

The magnetic moment produced in a substance of 10^-3 kg is 5 × 10^−7A−m2. If its density is 6 X 10^3 kg/m^3, then the intensity of magnetisation in A/m will be :

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