T6 L3 Electromagnetic Force

How is a magnetic field created by a current-carrying wire?

• Due to the temperature of the wire

• As a result of the wire's length

• Due to the movement of electric charges within the wire

• Because of the color of the wire

How does an electromagnet differ from a permanent magnet?

• An electromagnet is made of copper while a permanent magnet is made of iron.

• An electromagnet is only used in small electronic devices while a permanent magnet is used in large machinery.

• An electromagnet has a weaker magnetic force than a permanent magnet.

• An electromagnet can be turned on and off by controlling the flow of electricity.

How does the strength of a magnetic field change with the distance from the current-carrying wire?

• Remains constant

• Decreases

• Increases

• Becomes zero

What are the applications of electromagnetic force in everyday life?

• Benefits in space exploration

• Some applications include electric motors, generators, transformers, MRI machines, and everyday electronics like smartphones and computers.

• Applications in agriculture

• Uses in marine biology

How does the direction of the current affect the direction of the magnetic field in a current-carrying wire?

• The direction of the current does not affect the direction of the magnetic field

• The direction of the magnetic field is always perpendicular to the direction of the current

• The direction of the magnetic field is always parallel to the direction of the current

• The direction of the magnetic field is opposite to the direction of the current

What happens to the magnetic field when the current in the wire is reversed?

• The magnetic field also reverses direction

• The magnetic field becomes stronger

• The magnetic field becomes weaker

• The magnetic field disappears

The magnetic field lines are__________.

• curves

• closed loops

• lines

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

What is the device shown?

• Solenoid

• Electromagnet

• Generator

• Motor

The Right Hand Rule says that if you hold a wire in your right hand and point your thumb in the direction of the ______ , the direction that your fingers curl is the direction of the _______.

• current , magnetic field

• magnetism, magnetic field

• magnetism, current field

• current, current field