Magnetic Fields and Current Flow Quiz

What happens to the direction of force on positive charges when a magnetic field is applied into the board?

• The force is directed downward.

• The force is directed to the right.

• The force is directed upward.

• The force is directed to the left.

In the right-hand rule, what does the thumb represent when considering conventional current?

• The direction of the velocity.

• The direction of the current.

• The direction of the magnetic field.

• The direction of the force.

What is the real current in a wire?

• Flow of neutral particles.

• Flow of positive charges.

• Flow of negative charges.

• Flow of magnetic fields.

How did historical scientists initially guess the direction of current flow?

• They thought it was magnetic fields flowing.

• They thought it was negative charges flowing.

• They thought it was neutral particles flowing.

• They thought it was positive charges flowing.

What must be true for a wire to hover in the air due to magnetic forces?

• The magnetic force must be greater than the gravitational force.

• The magnetic force must be less than the gravitational force.

• The magnetic force must be zero.

• The magnetic force must equal the gravitational force.

What is the relationship between magnetic force, magnetic field, current, and wire length?

• Magnetic force is inversely proportional to the magnetic field, current, and wire length.

• Magnetic force is directly proportional to the magnetic field, current, and wire length.

• Magnetic force is directly proportional to the magnetic field and inversely proportional to the current.

• Magnetic force is directly proportional to the current and inversely proportional to the wire length.

What is the unit conversion needed for mass per unit length from grams per centimeter to kilograms per meter?

• Multiply by 10.

• Divide by 10.

• Divide by 100.

• Multiply by 100.

What is the formula for calculating the magnetic field in the given problem?

• Magnetic field = g * L / (I * m)

• Magnetic field = I * m / (g * L)

• Magnetic field = m * g / (I * L)

• Magnetic field = I * L / (m * g)

What is the value of gravitational acceleration used in the problem?

• 9.2 meters per second squared

• 9.8 meters per second squared

• 10 meters per second squared

• 9.6 meters per second squared

What is the current flowing through the wire in the problem?

• 10 amps

• 20 amps

• 15 amps

• 5 amps