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 Multiple Choice QuestionsMultiple Choice Questions

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1.

A long solenoid has 1000 turns. when a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4x10-3 Wb. The self inductance of the solenoid is,

  • 3H

  • 2H

  • 1H

  • 1H

2240 Views

2.

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude.

  • fraction numerator straight mu subscript straight o ne over denominator 2 πr end fraction
  • zero

  • fraction numerator straight mu subscript straight o straight n squared straight e over denominator straight r end fraction
  • fraction numerator straight mu subscript straight o straight n squared straight e over denominator straight r end fraction
2390 Views

3.

A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown n the figure. The frame moves to the right with constant velocity 'v'. The emf induced in the frame will be proportional to



  • 1 over straight x squared
  • fraction numerator 1 over denominator left parenthesis 2 straight x minus straight a right parenthesis squared end fraction
  • fraction numerator 1 over denominator left parenthesis 2 straight x plus straight a right parenthesis squared end fraction
  • fraction numerator 1 over denominator left parenthesis 2 straight x plus straight a right parenthesis squared end fraction
1720 Views

4.

A coil of resistance 400 is placed in magnetic field. If the magnetic flux Φ (Wb) linked with the coil varies with time t  (sec) as Φ = 50t2 +4.
The current in the coil at t= 2 s is

  • 0.5 A

  • 0.1 A

  • 2 A

  • 2 A

1437 Views

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5.

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is

  • zero

  • Bvπr squared divided by 2 space and space straight P is at higher potential
  • πrBv and R is at higher potential
  • πrBv and R is at higher potential
954 Views

6.

The current (I) in the inductance is varying with time according to the plot shown in a figure.

713 Views

7.

A coil of self -inductance L is connected in series with a bulb b and an AC source. Brightness of the bulb decreases when

  • frequency of the AC source is decreases

  • number of turns in the coil is reduced

  • a capacitance of reactance Xc=XL is  included in the same circuit

  • a capacitance of reactance Xc=XL is  included in the same circuit

1954 Views

8.

A current loop in a magnetic field

  • experiences a torque whether the field is uniform or non-uniform in all orientations

  • can be in equilibrium in one orientations

  • can be an equilibrium in two orientations, both the equilibrium states are unstable

  • can be an equilibrium in two orientations, both the equilibrium states are unstable

1893 Views

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9.

The rate of increase of thermo - emf with temperature at the neutral temperature of a thermocouple

  • is zero

  • depends upon the choice of the two materials of the thermocouple

  • is negtive

  • is negtive

450 Views

10.

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

965 Views

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