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qUESTIONS

Photoelectric emission is observed from a metallic surface for frequencies ‘v1’ and ‘v2’ of the incident light rays. If the ratio of maximum value of the kinetic energy of the photoelectrons emitted in first case to that in second case is 2: K, then the threshold frequency of the metallic surface is :[MHT-CET 2023]

A magnetizing field of 1000 A/m produces a magnetic flux of 2.4 * 10 ^ – 5 Wb in an iron bar of cross-sectional area 0.3c * m ^ 2 The magnetic permeability of the iron bar in SI unit is:

The equation of alternating current is I = 40√2 sin200 πε ampere, then the frequency and r.m.s. value of current is respectively

When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit:

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:

An inductance of 300/π mH, a capacitance of 1/π mF and a resistance of 20 Ω are connected in series with a.c. source of 240 V, 50 Hz. The phase angle by which the voltage leads the current in the circuit is

A voltage source V = V0 sin(ωt + Φ) is applied to a circuit containing a resistance ‘R’, capacitance ‘C’ and inductance ‘L’ in series. The current will be maximum when:

A coil having an inductance of 1/π H is connected in series with a resistance of 300 Ω. If A.C. source (20 V-200 Hz) is connected across the combination, the phase angle between voltage and current is :

In an L-C circuit, angular frequency at resonance is ‘ω’. If the inductor’s inductance is made twice and capacitor’s capacitance is made four times, the new angular frequency at resonance will be :

In LCR series resonance circuit, choose the wrong statement

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