Quest 2 - Sources of Magnetic Field

According to Ampere's Law, the line integral of the magnetic field around any closed path is equal to:

• The total electric charge enclosed

• The product of current and resistance

• The permeability times the enclosed current

• The square of the enclosed current

The magnetic field around a long, straight, current-carrying wire follows which law?

• Coulomb’s Law

• Gauss’s Law

• Biot-Savart Law

• Ohm’s Law

What is the direction of the magnetic field produced by a straight current-carrying wire?

• Along the length of the wire

• Radially outward from the wire

• In circular loops around the wire

• Opposite to the direction of current

The magnetic field at a distance r from a long, straight, current-carrying wire is given by:

• B = μ₀I / 2πr

• B = μ₀I / r²

• B = I / μ₀r

• B = I / 2πr

When two long, parallel conductors carry current in opposite directions, they will:

• Attract each other

• Repel each other

• Have no interaction

• Align perpendicular to each other

The magnetic force per unit length between two parallel, current-carrying conductors is given by:

• F/L = μ₀I₁I₂ / 2πr

• F/L = μ₀I₁I₂ / 4πr

• F/L = I₁I₂ / μ₀r

• F/L = I₁I₂ / 2πμ₀r

What is the shape of the magnetic field produced by a circular current loop?

• Radial lines extending outward

• Concentric circles around the loop

• A uniform field along the axis of the loop

• No magnetic field is produced

A solenoid is defined as:

• A straight conductor carrying current

• A helical coil of wire carrying current

• A closed-loop conductor

• A capacitor with stored charge

The magnetic field inside an ideal solenoid is given by:

• B = μ₀NI / l

• B = NI / μ₀l

• B = μ₀l / NI

• B = μ₀l / r²

The magnetic field inside a toroid is given by:

• B = μ₀NI / 2πr

• B = μ₀ / r²

• B = NI / μ₀r

• B = I / μ₀Nr