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Electromagnetic Field Theory

Electromagnetic Field Theory
The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper cable of 60 mm diameter is

 3.2 H.
 32 mH.
 3.2 mH.
 3.2 µH.

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Electromagnetic Field Theory
A fan blade of length 2R rotates in a time period T in a magnetic field B. The induced voltage in the blade is proportional to

 R2B / T.
 R2BT.
 2RBT.
 RBT.

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Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is

 1.15 joule.
 0.015 joule.
 0.015 joule.
 0.15 joule.

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Electromagnetic Field Theory
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

None of these
Refraction
Reflection
Transmission

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Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 764 N.
 7640 N.
 76400 N.
 76.4 N.

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Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 832.29 N.
 3332.47 N.
 6664.8 N.
 1666.22 N.

ANSWER DOWNLOAD EXAMIANS APP
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