Magnetic Forces Between Currents

The video tutorial explores the interaction between two currents in wires, explaining how they attract or repel each other based on their direction. It uses the right-hand rule to determine the direction of magnetic fields and forces. A numerical example is provided to calculate the force between wires with opposite currents, demonstrating the application of magnetic field equations and the concept of net force.

What happens when two currents flow in the same direction?

• They repel each other.

• They create a magnetic field.

• They attract each other.

• They have no effect on each other.

What is the right-hand rule used for in the context of magnetic fields?

• To find the direction of the magnetic field.

• To measure the distance between wires.

• To determine the strength of the magnetic field.

• To calculate the current in a wire.

When two currents flow in opposite directions, what is the net force between them?

• No force

• Repulsion

• Attraction

• It depends on the wire material

What is the formula for calculating the magnetic field created by a current?

• B = μ₀I / r²

• B = μ₀I / 2πr

• B = I / r

• B = μ₀I² / r

How does the magnetic field strength change with distance from the wire?

• It remains constant.

• It fluctuates randomly.

• It increases with distance.

• It decreases with distance.

What is the unit of magnetic field strength?

• Newton

• Tesla

• Volt

• Ampere

What is the direction of the net force on a wire when using the right-hand rule?

• Perpendicular to the magnetic field

• In the direction of the current

• In the direction of the thumb

• Opposite to the current

What is the effect of the magnetic field on the acceleration of a wire as it moves away?

• The wire stops moving.

• The acceleration remains constant.

• The acceleration decreases.

• The acceleration increases.

What is the magnitude of the force between two wires with opposite currents?

• 1.2 x 10⁻² N

• 2.4 x 10⁻² N

• 3.6 x 10⁻² N

• 4.8 x 10⁻² N

What happens to the net force as the distance between two wires increases?

• It becomes zero.

• It increases.

• It remains the same.

• It decreases.