At certain place, the horizontal component of Earth's magnetic fi

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 Multiple Choice QuestionsMultiple Choice Questions

21.

A bar magnet is equivalent to

  • torroid carrying current

  • straight conductor carrying current

  • solenoid carrying curren

  • circular coil carrying current


22.

The electrons in the beam of a television tube move horizontally from South to North. The vertical component of the earth's magnetic field points down. The electron is deflected towards

  • West

  • no deflection

  • East

  • North to South


23.

Among the followmg properties describing diamagnetism identify the property that is wrongly stated :

  • Diamagnetic material do not have permanent magnetic moment

  • Diamagnetism is explained in terms of electromagnetic induction

  • Diamagnetic materials have a small positive susceptibility

  • The magnetic moment of individual electrons neutralize each other


24.

Ferromagnetic materials used in a transformer must have

  • low permeability and high hysterisis loss

  • high permeability and low hysterisis loss

  • high permeability and high hysterisis loss

  • low permeability and low hysterisis loss


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25.

A susceptibility of a certain magnetic material is 400. What is the class of the magnetic material ?

  • Diamagnetic

  • Paramagnetic

  • Ferromagnetic

  • Ferroelectric


26.

Core of electromagnets are made of ferromagnetic material which has

  • low permeability and high retentivity

  • high permeability and low retentivity

  • low permeability and low retentivity

  • high permeability and high retentivity


27.

An aircraft with a wingspan of 40 m flies with a speed of 1080 km/h in the Eastward direction at a constant altitude in the Northern  hemisphere, where the vertical component of the Earth's magnetic field is 1.75 × 10-5 T. Then the emf developed between the tips of the wings is

  • 0.21 V

  • 0.5 V

  • 2.1 V

  • 0.34 V


28.

The magnetic susceptibility of a paramagnetic material at -73°C is 0.0075 and its value at − 173°C will be

  • 0.015

  • 0.0045

  • 0.0075

  • 0.0030


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29.

χ1 and χ2 are susceptibility of a paramagnetic material at temperatures T1 K and T2 K respectively, then

  • χ1 = χ2

  • χ1T1 = χ2T2

  • χ1T2 = χ1T1

  • χ1 T1 = χ2 T2


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30.

At certain place, the horizontal component of Earth's magnetic field is 3.0 G and the angle dip at that place is 30°. The magnetic field of Earth at that location is

  • 4.5 G

  • 5.1 G

  • 3.5 G

  • 6.0 G


C.

3.5 G

Given, H = 3.0 gaussAngle of dip, δ = 30°  HB = cos δ   H = B cos δ3.0 = B × cos 30°   B = 3.0cos 30° = 33/2 = 2 × 33      = 61.73 B   = 3.5 G 


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