Moving Against the Force
Understand how working against a magnetic force stores potential energy: pushing repelling magnets together or pulling attracting magnets apart adds energy to the magnetic field.
Key Concepts
Energy is added to the magnetic field when an external force acts against the natural magnetic force.
Pushing repelling magnets together (against the push) adds energy.
Common Questions
How is potential energy stored in a magnetic field?
When you push two repelling magnets together or pull two attracting magnets apart, you do work against the magnetic force. That work is stored as potential energy in the field.
What does 'moving against the force' mean in Grade 8 physics?
It means applying an external force opposite to the existing force. Pushing repelling magnets together works against their outward push, storing energy in the magnetic field.
How does magnetic potential energy compare to gravitational potential energy?
Just as lifting an object stores gravitational potential energy by working against gravity, compressing repelling magnets stores magnetic potential energy by working against magnetic repulsion.