Magnetic Effect of Electric Current

Which of the the following is not attracted by a bar magnet?

• Steel

• cobalt

• brass

• nickel

State whether true or false:-

The axis of earth's imaginary magnet and the geographical axis coincide with each other.

• True

• False

A strong bar magnet is placed vertically above a horizontal wooden board. The magnetic lines of force will be:

• Only in horizontal plane around the magnet

• Only in vertical plane around the magnet

• in horizontal as well as in vertical planes around the magnet

• in all planes around the magnet

The magnetic field lines produced by a bar magnet:

• Originate from the South Pole and the end at its North Pole

• Originate from the North Pole and the end at its East Pole

• Originate from the North Pole and the end at its South Pole

• Originate from the South Pole and the end at its West Pole

The magnetic field lines :

• Intersected right angles to one another

• intersect at an angle of 45 degrees to each other

• do not cross one another

• Close at an angle of 60 degree to one another

The North Pole of earth magnet is in the:

• geographical South

• geographical east

• geographical west

• geographical north

The axis of earth's magnetic field is inclined with the geographical axis at an angle of about:

• 5 degree

• 15 degree

• 25 degree

• 35 degree

The shape of the earth's magnetic field resembles that of an imaginary:

• U-shaped magnet

• Straight conductor carrying current

• Current caring circular coil

• Bar magnet

a magnet attracts:

• plastics

• Any metal

• Aluminium

• Iron and steel

A plotting compass is placed near the South Pole of a bar magnet. The pointer of plotting compass will be:

• point away from the south pole

• point parallel to the south pole

• point towards the south pole

• Points at right angles to the South Pole