The unit of flux is the same as that of_______________?

A. Reluctance
B. Resistance
C. Permeance
D. Pole strength

The commonly used material for shielding or screening magnetism is____________?

A. Copper
B. Aluminium
C. Soft iron
D. Brass

The Biot-savart’s law is a general modification of_______________?

A. Kirchhoffs law
B. Lenz’s law
C. Ampere’s law
D. Faraday’s laws

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

A. Less than that of disc but in opposite direction
B. Equal to that of disc and in the same direction
C. Equal to that of disc and in the opposite direction
D. Less than that of disc and in the same direction

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

A. 2
B. 4
C. 6
D. 8

The materials are a bit inferior conductors of magnetic flux than air

A. Ferromagnetic
B. Paramagnetic
C. Diamagnetic
D. Dielectric

he retentivity (a property) of material is useful for the construction of__________?

A. Permanent magnets
B. Transformers
C. Non-magnetic substances
D. Electromagnets

he retentivity (a property) of material is useful for the construction of_______________?

A. Permanent magnets
B. Transformers
C. Non-magnetic substances
D. Electromagnets

A permanent magnet______________?

A. Attracts some substances and repels others
B. Attracts all paramagnetic substances and repels others
C. Attracts only ferromagnetic substances
D. Attracts ferromagnetic substances and repels all others

The relative permeability of materials is not constant

A. Diamagnetic
B. Paramagnetic
C. Ferromagnetic
D. Insulating