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Magnetism and Electromagnetism

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?

8
4
6
12

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

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

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Magnetism and Electromagnetism
The relative permeability is less than unity is case of

Paramagnetic material
Ferromagnetic material
Diamagnetic material
Ferrits

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Magnetism and Electromagnetism
A permeable substance is one

Which is a bad conductor
Which is a strong magnet
Through which the magnetic lines of force can pass very easily
Which is a good conductor

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

hysteresis
permeability
reluctance
retentivity

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Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line of magnetic flux which does not follow the designed path
A line vertical to the flux lines
A line of magnetic flux in a non-uniform field
The mean length of a ring shaped coil

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