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Electromagnetic Field Theory

Electromagnetic Field Theory
In above problem, if the inductance L1 and L2 in series aiding with 30 mH mutual inductance, then total inductance will be

 150 mH.
 200 mH.
 100 mH.
 50 mH.

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Retentivity.
 Saturation magnetism.
 Coercivity.
 Hysteresis.

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 75 V.
 100 V.
 25 V.
 50 V.

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Electromagnetic Field Theory
A sphere of radius with a uniform charge density ρv C/m3 shall have electric flux density at radius “r = a” equal to

 aρv C/m2.
 aρv/4 C/m2.
 aρv/3 C/m2.
 ρv/3 C/m2.

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Electromagnetic Field Theory
The drawback of Daltons atomic structure is that, it says

 the atoms can neither be created nor be destroyed.
 unique nature of atom.
 none of these.
 most of the volume of an atom is empty space.

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = sinφ Ir.
 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir - sinφ Ir.
 A = cosφ Ir.

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