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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

0.24 N
240 N
24 N
2.4 N

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

slightly less than unity
equal to unity
slightly more than unity
equal to that ferromagnetic mate rials

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Increase
Decrease
Remain Constant
Be excessive

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Magnetism and Electromagnetism
Reciprocal of permeability is

Permeability
Reluctivity
conductance
Susceptibility

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Magnetism and Electromagnetism
Core of an electromagnet should have

Both low coercivity and high susceptibility
None of the listed here
Low coercivity
High susceptibility

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

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

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