EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100
Observe the following figure.
How can you tell from the pattern that the field gets weaker as you get further from the wire?
Important Questions on Electromagnetic Forces
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Look back at the diagram of the relay shown in the figure below.
Why is the coil fitted with a soft iron core?
EASY
Upper Secondary: IGCSE
IMPORTANT
Consider the figure given below.
Suppose that the two magnets were turned around so that there was a magnetic north pole on the left. Explain how the coil would move.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
In a D.C. motor, why must the current to the rotor coil be reversed twice during each rotation?
EASY
Upper Secondary: IGCSE
IMPORTANT
What device reverses the current in a DC motor?
EASY
Upper Secondary: IGCSE
IMPORTANT
Describe how the turning effect of a d.c. motor will change if the current flowing through the motor coil is increased.
EASY
Upper Secondary: IGCSE
IMPORTANT
List two ways to reverse the force on a current-carrying conductor in a magnetic field.
EASY
Upper Secondary: IGCSE
IMPORTANT
For Fleming's left-hand rule, write down the three things that are to each other, and next to each one write down the finger or thumb that represents it.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
List two ways to increase the force on a current-carrying conductor in a magnetic field.
