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Magnetism and Electromagnetism

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
240 N
0.24 N
2.4 N

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Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

30 At
18.75 At
300 At
187 At

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Placing it inside a coil carrying current
Rubbing with another magnet
The use of permanent magnet
Induction

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid
Polarity of a magnetic pole
Direction of force on a current carrying conductor in a magnetic field

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Magnetism and Electromagnetism
The force between two long parallel conductors is inversely proportional to

Radius of conductor
Product of current in two conductors
Current in one conductor
Distance between the conductors

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

decreases
increases
reverses polarity
remains unchanged

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MORE MCQ ON Magnetism and Electromagnetism

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