Grade 10 Magnetic Effects of Electric Current

Inside the magnet, the field lines moves

• From north to south

• From south to north

• away from south pole

• away from north pole

By which instrument, the presence of magnetic field be determined

• Magnetic needle

• Ammmeter

• Galvanometer

• Voltmeter

The pattern of the magnetic field produced by the straight current carrying conductor 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 strength of magnetic field around a current carrying conductor is

• Inversely proportional to the current but directly proportional to the square of the distance from wire.

• Directly proportional to the current and inversely proportional to the distance from wire.

• Directly proportional to the distance and inversely proportional to the current.

• Directly proportional to the current but inversely proportional to the square of the distance from wire.

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

• circular

• ellipse

• parabolic

• straight line

The factors on which one magnetic field strength produced by current carrying solenoid depends on

• Magnitude of current

• Number of turns

• Nature of core material

• All of the above

A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid

• will increase

• will remains the same

• will decrease

• will become zero

Earth wire carries

• Current

• Voltage

• No current

• None of the above

Which are the characteristics of fuse element?

• High conductivity

• Low melting point

• Do not burn due to oxidation

• All of the above.

The most important safety method used for protecting home appliances from short circuiting or overloading is

• Earthing

• Use of fuse

• Use of stabilizers

• Use of electric meter