Three ways of reducing the strength of electromagnet?

1. Decreasing the current flowing through the electromagnet: By reducing the amount of current flowing through the electromagnet, the strength of the magnetic field produced by the electromagnet will also decrease.

2. Increasing the resistance in the circuit: By adding resistance to the circuit that powers the electromagnet, the amount of current flowing through the electromagnet will decrease, resulting in a weaker magnetic field.

3. Using a material with lower magnetic permeability: By using a material with lower magnetic permeability in the core of the electromagnet, the strength of the magnetic field produced by the electromagnet will be reduced.

1. Decrease the number of coils in the electromagnet.
2. Decrease the current flowing through the electromagnet.
3. Use a material with a lower magnetic permeability for the core of the electromagnet.