Magnetism

Front

What is magnetism?

Back

Magnetism is a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

Front

What causes magnetism?

Back

Magnetism is caused by moving charges, such as electrons in motion.

Front

What is the unit of magnetic field strength?

Back

The unit of magnetic field strength is the Tesla (T).

Front

How does the force on a current-carrying wire change with the length of the wire?

Back

The force is directly proportional to the length of the wire in the magnetic field; doubling the length doubles the force.

Front

What happens to the force on a wire if the current is doubled?

Back

The force on the wire is also doubled, as the force is directly proportional to the current.

Front

If the magnetic field strength is quadrupled, how does it affect the force on a wire?

Back

The force on the wire is quadrupled, as the force is directly proportional to the magnetic field strength.

Front

What is the relationship between current direction in two parallel wires and the force they exert on each other?

Back

If the currents in two parallel wires flow in the same direction, they attract each other; if they flow in opposite directions, they repel each other.

Front

What is the formula for calculating the force on a current-carrying wire in a magnetic field?

Back

F = BIL sin(θ), where F is the force, B is the magnetic field strength, I is the current, and L is the length of the wire.

Front

What is the effect of reducing the length of a wire on the force exerted on it in a magnetic field?

Back

Reducing the length of the wire decreases the force exerted on it, as the force is directly proportional to the length.

Front

If the current is halved and the magnetic field is reduced to a quarter, what current is needed to maintain the same force?

Back

To maintain the same force, the current must be increased to 16 A.