Magnetic Forces and Current Direction

The video tutorial explains how to calculate the magnetic force between two wires with currents flowing in opposite directions. It covers the basic concepts of magnetic force, the right hand rule, and the formula for calculating magnetic force. The tutorial also includes a second problem involving a wire with current and gravitational force, demonstrating how to achieve equilibrium by calculating the necessary current in a second wire.

What happens to the magnetic force between two wires if the currents are flowing in the same direction?

• The force is perpendicular to the wires.

• The wires attract each other.

• There is no magnetic force.

• The wires repel each other.

According to the right-hand rule, if your thumb points in the direction of the current, what do your fingers represent?

• The direction of the electric field

• The direction of the magnetic field

• The direction of the force

• The direction of the current

What is the formula for the magnetic field created by a current-carrying wire?

• B = μ₀I/4πr

• B = μ₀I²/4πr

• B = μ₀I²/2πr

• B = μ₀I/2πr

What is the effect on the wires when currents flow in opposite directions?

• The wires rotate.

• The wires attract each other.

• The wires repel each other.

• There is no effect.

Which of the following is used to calculate the magnetic force between two wires?

• F = μ₀I₁I₂L/2πr

• F = μ₀I₁I₂/4πr

• F = μ₀I₁I₂/2πr

• F = μ₀I₁I₂L/4πr

What is the calculated magnetic force acting on each wire in the first problem?

• 0.05 N

• 0.10 N

• 0.15 N

• 0.20 N

In the second problem, what direction must the current in the second wire flow to prevent it from falling?

• East

• North

• West

• South

What is the force per unit length required to keep the second wire from falling?

• 0.069 N/m

• 0.059 N/m

• 0.049 N/m

• 0.079 N/m

How is the mass per unit length converted from grams to kilograms?

• Multiply by 1000

• Divide by 100

• Divide by 1000

• Multiply by 100

What is the calculated current in the second wire to maintain equilibrium?

• 69 amps

• 59 amps

• 49 amps

• 39 amps