Magnetic Effect of a Current

Who was the first to observe the magnetic effect of electric current?

• Faraday

• Oersted

• Volta

• Ampere

Magnetic field inside a long solenoid carrying current is

• same at all points (uniform)

• different at poles and at the centre

• zero

• different at all points

The magnetic field lines due to a straight wire carrying a current are

• straight

• circular

• parabolic

• elliptical

Which of the following correctly describes the magnetic field near a long straight wire?

• The field consists of straight lines perpendicular to the wire.

• The field consists of straight lines parallel to the wire.

• The field consists of radial lines originating from the wire.

• The field consists of concentric circles centred on the wire.

The relative strength of the magnetic field is shown by the degree of closeness of the field lines.

• false

• true

• can't say

A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:

• From top to bottom

• From left to right

• From bottom to top

• From right to left

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

• A

• B

• C

• D

The shape of the magnetic field lines produced by a current carrying conductor are:

• Straight lines

• Concentric circles

• Concentric ellipse

• Concentric parabolas

The pattern of the magnetic field produced by the straight current carrying conducting wire is

• in the direction opposite to the current

• in the direction parallel to the wire

• circular around the wire

• in the same direction of current

The nature of magnetic field line passing through the centre of current carrying circular loop is :

• circular

• ellipse

• parabolic

• straight line