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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 mH.
 3.2 µH.
 32 mH.
 3.2 H.

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Electromagnetic Field Theory
1 Tesla =

 1 wb- m2.
 1 wb .
 1 wb/ m2.
 1 wb/m.

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Electromagnetic Field Theory
In H-plane metal plate lens the travelling wave front is

Accelerated
Retarded
Neither accelerated nor retarded
Totally retarded

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Electromagnetic Field Theory
Electric field intensity (E) at ant point in an electric field is equal to

 potential gradient.
 (potential gradient)2.
 (potential gradient)1/2.
 (potential gradient)1/3.

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Electromagnetic Field Theory
A circular ring is carrying uniformly distributed charge q and a point charge – Q on the axis of the ring. The magnitude of dipole moment of the charge system is (Assume distance between centre of ring and point charge is d and radius of ring R)

 QR2/d.
  QD.
 Q√(R2 + d2).
 QR.

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Electromagnetic Field Theory
What is the value of skin depth as 100 Hz in a material having μr = 1.0 and & σ = 3.60 × 107 s/m

 8.4 mm.
 4 mm.
 2.4 mm.
 10 mm.

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