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Electromagnetic Field Theory

Electromagnetic Field Theory
If E is the electric field intensity, then what is the value of divergence of (curl of E)?

 Null vector.
 Zero.
 E.
 | E |.

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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

 5 mH.
  10 mH.
 0 mH.
 20 mH.

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Electromagnetic Field Theory
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The current of 3 A will be

 37.68 mH.
 113.04 µH.
 37.68 µH.
 113.04 mH.

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 5 N.
 3.75 N.
 2.5 N.
 2 N.

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Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 10 cm long and 4 cm diameter wound with 2000 turns of wire carrying a current at 20 amp, is

 24 joules.
 30 joules.
 12 joules.
 15 joules.

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Electromagnetic Field Theory
An infinite sheet has a charge density of 150 μ C/m. The flux density in μ C/m 2 is

 50.
 1/75.
 75.
 100.

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