Magnetic Effects of Current

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

• Faraday

• Oersted

• Volta

• Ampere

At the centre of which of the following four circular rings the magnetic field is the strongest?

• Loop 1

• Loop 2

• Loop 3

• Loop 4

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

Magnetic field produced around a straight conductor due to current in it is given by

• Fleming's right hand rule

• Right hand thumb rule

• Clock rule

• Fleming's left hand rule

Direction of magnetic field produced by a current carrying loop can be found by using

• Fleming's Right hand rule

• Clock Rule

• Fleming's Left hand rule

• Maxwell's corkscrew rule

A freely suspended bar magnet always rest in N-S direction

• True

• False

Refer the diagram. A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• n the same direction as the magnetic field

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

• false

• true

• can't say

A wire is parallel to the lines of the force of the magnetic field and the current flows in the wire. Then

• The wire will experience a force along the direction of the magnetic field

• The wire will not experience any force

• The wire will experience the torque

• The wire will experience a perpendicular force