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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1111 At/Wb
111 At/Wb
11 At/Wb
1 At/Wb

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Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

current
Voltage
magnetic field
direction of force on the conductor

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Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

24 N
0.24 N
2.4 N
240 N

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

2.4 AT
0.24 AT
240 AT
24 AT

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Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

12
6
8
4

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Magnetism and Electromagnetism
Ferrites are a sub-group of

Ferro magnetic material
Ferri-magnetic material
Non-magnetic materials
Paramagnetic material

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MORE MCQ ON Magnetism and Electromagnetism

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