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An air-cored solenoid of length 50cm and...

An air-cored solenoid of length 50cm and area of cross-sectional `28 cm^(2)` has 200 turns and carries a current of 5.0 A. On switching off, the current decreases to zero within a time interval of 1.0 ms. Find the average emf induced across the ends of the open switch in the circuit.

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The correct Answer is:
1.4 V
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An air cored solenoid of length 50 cm and area of cross section 20 m^(2) has 200 turns and carries a current of 5.0 A. On switching off, the current decreases to across the ends of the solenoid.

An air-cored solenoid with length 30 cm, area of cross-section 25 cm^(2) and number of turns 500, carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10^(-3) s . How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in magnetic field near the ends of the solenoid.

Knowledge Check

  • An air- conred solectioid with length 30 cm,area of cross-section 25 cm^(2) and number of turns 500, carries a curent is suddenly switched off in a brief time of 10^(-3)s . How much is the average back emf induced across the ends of the opne switch in the circuit ? lgnore the variation inmagnetic field near the of the solenoid .

    A
    6.5 V
    B
    7.4 V
    C
    8.2 V
    D
    9.3 V

  • An air-cored solenoid with length 30 cm, area of cross-section 25 cm^(2) and number of turns 800, carries a current of 2.5A The current is suddenly switched off in a brief time of 10^(-3)s . Ignoring the variation in magnetic field near the ends of the solenoid, the average back emf induced across the ends of the open switch in the circuit would be:

    A
    Zero
    B
    3.125 volts
    C
    6.54 volts
    D
    16.74 volts

  • The inductance of a solenoid 0.5m long of cross-sectional area 20cm^(2) and with 500 turns is

    A
    `12.5 mH`
    B
    `1.25mH`
    C
    `15.0mH`
    D
    `0.12mH`

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    An air cored solenoid with length 30 cm, area of cross-section 25 cm^(2) and number of turns 500 carries a current of 2.5 A . The current is suddenly switched off in a brief time of 10^(-3) s. How much is the average back e.m.f. induced across the ends of the open switch in the circuit ? Ignore the variation in magnetic field near the ends of the solenoid.

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