Quiz 1 - Magnetic Effect of a Current-Carrying Conductor

Magnets that behave as permanent magnets when in the presence of electric current is called as?

• Permanent magnet

• Temporary magnet

• Paramagnetic

Below are the categories of permanent magnets except...

• Alnico

• Samarium coblat

• neodymium iron boron

• molybdenum

How does an electromagnet is made?

• by winding a coil of insulated wire round a bar magnet

• by winding a coil of insulated wire round a soft iron core

• by moving a copper wire quickly parallel with the magnetic field lines

• by connecting the insulated wire round a bar magnet

Choose the correct statement about the property of an electromagnet.

• The iron core is a hard magnetic material

• The iron core continues magnetized when no current flows

• The iron core becomes de-magnetized when no current flows

• Electromagnet does not produces polarity and magnetic field pattern

The pattern of the magnetic field lines of a straight wire are concentric circles.

• True

• False

• Not sure

Below are the methods to determine the direction of the magnetic field due to a current-carrying conductor except...

• 
• 
• 

From the diagram above, which one is correct about the magnetic field strength around a conductor?

• Strength of the magnetic field decreases as the distance from the wire increases

• Strength of the magnetic field will increase if the current is decreased

• Strength of the magnetic field decreases as the distance from the wire decreases

• Strength of the magnetic field will decrease if the current is increased

How to increase the strength of the magnetic field of a coil?

• Using coil of smaller radius

• Decrease the number of turns of coil

• Downsize the magnitude of current in the coil

The polarity at the ends of the solenoid can be determined by the following methods below except...

• using right-hand grip rule

• by looking at the end of the solenoid

• using Fleming's left-hand rule

Factors affecting the strength of the magnetic field of an electromagnet such as..

• Use copper core

• Use small size of current

• Decreasing the number of turns in the conductor

• None of the above