Magnetic Field of a Wire

Mr. Andersen explains the relationship between magnetism and electricity, focusing on the magnetic field around a wire. He discusses Hans Christian Orsted's discovery that a moving charge creates a magnetic field, demonstrated by a compass deflection. The video covers how the magnetic field's magnitude is influenced by current and distance, and how the right-hand rule helps determine its direction. It also explores magnetic fields in circuits, the effects of multiple wires, and the forces between them. Key concepts include the right-hand rule, magnetic permeability, and the interaction of magnetic fields.

What did Hans Christian Orsted discover about moving charges?

• They lose energy.

• They create a magnetic field.

• They become stationary.

• They repel each other.

What determines the direction of the magnetic field around a wire?

• Left-hand rule

• Electric potential

• Right-hand rule

• Magnetic compass

How does the magnetic field change when the current in a wire increases?

• It disappears.

• It increases.

• It remains the same.

• It decreases.

What happens to a compass needle when placed near an electromagnet with current?

• It spins.

• It points north.

• It remains still.

• It points south.

What occurs when the current in an electromagnet is turned off?

• The magnetic field remains unchanged.

• The magnetic field reverses.

• The magnetic field disappears.

• The magnetic field strengthens.

How do two wires with current flowing in the same direction interact?

• They create a spark.

• They attract each other.

• They remain unaffected.

• They repel each other.

What is the effect of increasing the distance from a wire on the magnetic field?

• The magnetic field increases.

• The magnetic field decreases.

• The magnetic field remains constant.

• The magnetic field reverses.