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Electromagnetic Induction Test - 81

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Electromagnetic Induction Test - 81
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  • Question 1
    4 / -1
    There are two solenoids of same length and inductance L but their diameters differ to the extent that one can just fit into the other. They are connected in three different ways in series. (1) They are connected in series but separated by large distance, (2) they are connected in series with one inside the other and senses of the turns coinciding, (3) both are connected in series with one inside the other with senses of the turns opposite as depicted in Figs.1, 2 and 3 respectively. The total inductance of the solenoids in each of the case 1, 2 and 3 are respectively

    Solution

  • Question 2
    4 / -1
    Two coils of self inductance 2 mH & 8 mH are placed so close together that the effective flux in one coil is completely half with the other.The mutual inductance between these coils is.......
    Solution

  • Question 3
    4 / -1
    In the figure the magnetic energy stored in the coil is

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  • Question 4
    4 / -1
    A thin semicircular conducting ring of radius R is falling in a magnetic field B. Which is in limited area as shown in figure. At the position MNQ,the speed of ring is v and the potential difference developed across the ring is

    Solution

  • Question 5
    4 / -1
    A wire of length 2m is moving at a speed 2ms–1 keep its length perpendicular to uniform magnetic field of 0.5 T. The resistance of circuit joined with this wire is 6Ω. The rate at which work is being done to keep the wire moving at constant speed is ..........
    Solution

  • Question 6
    4 / -1

    Solution

  • Question 7
    4 / -1
    An inductor–resistor–battery circuit is switched on at t = 0. If the emf of battery is ϵ find the charge passes through the battery in one time constant τ.
    Solution

  • Question 8
    4 / -1
    An emf of 15 V is applied in a circuit containing 5H inductance & 10 Ω resistance. The ratio of the currents at time t = ∞ and at t = 1sec.
    Solution

  • Question 9
    4 / -1
    Two coils have a mutual inductance 0.005 H The current changes in a coil according to equation I = Iosinωt Where Io = 10 A & ω = 100 π rad s–1 The maximum value of emf in second coil is.....
    Solution

  • Question 10
    4 / -1
    A coil of inductance 8.4 mH and resistance 6Ω is connected to a 12 V battery. The current in the coil is 1A in the time..........
    Solution

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