What is the direction of the force exerted by a magnetic field on a charge that is moving?

• Tangential to the direction of motion

• Perpendicular to the direction of motion

• Opposite to the direction of motion

• Parallel to the direction of motion

What is the unit of magnetic field commonly used?

• Ohm

• Ampere

• Volt

• Tesla

What is the vector sum of the electric and magnetic forces known as?

• Newton's Law

• Lorentz Force

• Coulomb's Law

• Faraday's Law

What is responsible for shielding the earth from harmful effects of the 'solar wind'?

• Electric field

• Lorentz Force

• Magnetic field

• Van Allen belt

What is the force per unit length on a wire carrying current in a magnetic field?

• F = Bv

• F = BIL

• F = Bq

• F = nAeI

What is the product of current and area of a loop called?

• Magnetic field

• Electric field

• Ampere's Law

• Magnetic moment

What does Ampere's Law state about the integral of the magnetic field around a loop?

• It is equal to the enclosed current

• It is equal to the magnetic moment

• It is zero

• It is equal to the electric field

What is the direction of the magnetic field outside an infinitely long wire carrying current?

• Tangential

• Circular

• Radial inward

• Radial outward

What is the relationship between the magnetic field and distance inside a wire carrying current?

• B ∝ 1/r

• B ∝ r

• B ∝ 1/r^2

• B ∝ r^2

What is the force experienced by a charge moving at 1 metre per second perpendicularly to a field of one tesla?

• 1 newton

• 0.5 newton

• 3 newtons

• 2 newtons