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Alternating Current Test - 35
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Alternating Current Test - 35
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  • Question 1/10
    4 / -1
    A coil of 40 H inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2V battery. The time constant of the circuit is
    Solutions

  • Question 2/10
    4 / -1
    One conducting U tube can slide inside another as shown in Fig maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed V, then the e.m.f induced in the circuit in terms of B, l and V where l is the width of each tube, will be

    Solutions

  • Question 3/10
    4 / -1
    The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit ?
  • Question 4/10
    4 / -1
    A circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be
    Solutions

  • Question 5/10
    4 / -1
    A coil of inductance 300 mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in
    Solutions

  • Question 6/10
    4 / -1
    An infinitely long cylinder is kept parallel to a uniform magnetic field B directed along positive z-axis. The direction of induced current on the surface of cylinder as seen from the z axis will be
  • Question 7/10
    4 / -1
    A magnet is made to oscillate with a particular frequency, passing through a coil as shown in Fig. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

  • Question 8/10
    4 / -1
    As shown in Fig a metal rod makes contact and completes the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 T. If the resistance is 3Ω, force needed to move the rod with a constant speed of 2m/s is

    Solutions

  • Question 9/10
    4 / -1
    Three indentical coils, A, B and C are placed with their planes parallel to one another. Coils A and C carry currents as shown in Fig. Coils B and C are fixed in position and coil A is moved towards B. Then, current induced in B is in

  • Question 10/10
    4 / -1
    A vertical ring of radius r and resistance R falls vertically. It is in contact with two vertical rails which are joined at the top. The rails are without friction and resistance. There is a horizontal uniform magnetic field of magnitude B perpendicular to the plane of the ring and the rails. When the speed of the ring is v, the current in the section PQ is

    Solutions

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