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Electromagnetic...

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  • Question 1
    4 / -1

    In circular coil, when no. of turns is doubled and resistance becomes 1/4 th of initial, then inductance becomes

  • Question 2
    4 / -1

    A capacitor is fully charged with a battery. Then the battery is removed and a coil is connected with the capacitor in parallel, current varies as

  • Question 3
    4 / -1

    In the figure magnetic energy stored in the coil is

  • Question 4
    4 / -1

    In an LR-circuit, time constant is that time in which current grows from zero to the value (where I0 is the steady state current)

  • Question 5
    4 / -1

    The coefficient of mutual inductance of two coils is 6 mH. If the current flowing in one is 2 ampere, then the induced e.m.f. in the second coil will be

  • Question 6
    4 / -1

    A L – R circuit has a cell of e.m.f. E, which is switched on at time t = 0. The current in the circuit after a long time will be

  • Question 7
    4 / -1

    Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

  • Question 8
    4 / -1

    When the current changes from +2A to –2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is

  • Question 9
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    An inductance L and a resistance R are first connected to a battery. After sometime the battery is disconnected but L and R remain connected in a closed circuit. Then the current reduces to 37% of its initial value in

  • Question 10
    4 / -1

    Why the current does not rise immediately in a circuit containing inductance?

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