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An air-cored solenoid, 40 cm long and of cross-sectional area 5 cm2, is tightly wound with 400 turns of copper wire and carries a steady current of 10 A. (a) Calculate the self-inductance of the solenoid. (b) Find the emf induced if the current in the solenoid decreases to zero in 0.2 s.
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State the factors on which the magnetic coupling coefficient of two coils depends.
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With a neat diagram briefly describe the function of an open tube manometer.
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State the use of the acceptor circuit.
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A coil of resistance 5 Ω and self inductance 0.2 H is connected in series with variable capacitor across a 30 V(rms), 50 Hz supply. (i) At what capacitance resonance occur? (ii) Find the corresponding current.
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Obtain an expression for the self inductance of a solenoid.
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State the expression for the force per unit length between two infinitely long parallel conductors carrying current and hence define the SI unit of current.
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Electrostatic energy of 4 x 10−4 J is stored in a charged 25 pF capacitor. Find the charge on the capacitor.
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A toroid of a circular cross-section of radius 0.05 m has 2000 windings and a self-inductance of 0.04 H. What is (a) the current through the windings when the energy in its magnetic field is 2 × 10−6 J and (b) the central radius of the toroid?
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Find the reactance of a coil of inductance 100 mH at a frequency of 50 Hz.
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Derive an expression for energy stored in a capacitor.
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In LCR series circuit, the condition for current resonance is ______.
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In a capacitor of capacitance 20 µF, the distance between the plates is 2 mm. If a dielectric slab of width 1 mm and dielectric constant 2 is inserted between the plates, what is the new capacitance?
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A body of mass 0.5 kg performs SHM with amplitude 3 cm and force constant 10 N/m. Find its total energy.
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What is meant by magnetic coupling coefficient?
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What are the Uses of rejector circuit?
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What is binding energy of a hydrogen atom?
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The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.
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