Magnetic Force on Current

What is the equation for the current (I) in a wire, given charge carrier density (n), cross-sectional area (A), drift velocity (v_d), and charge per carrier (q)?

• I = nAv_d q

• I = nA/v_d q

• I = nq/Av_d

• I = nAv_d/q

What is the formula for the magnetic force (F_B) acting on a single moving charge (q) with velocity (v) in a magnetic field (B)?

• F_B = q(v x B)

• F_B = qvB

• F_B = (v x B)/q

• F_B = qv/B

Which equation represents the net magnetic force (F_B) acting on a current-carrying wire of length (L) with current (I) in a magnetic field (B)?

• F_B = IL x B

• F_B = I/L x B

• F_B = I x B / L

• F_B = IBL

What is the magnitude of the magnetic force (F_B) acting on a straight current-carrying wire of length (L) with current (I) in a uniform magnetic field (B), where θ is the angle between the direction of the current and the magnetic field?

• F_B = ILB sinθ

• F_B = ILB cosθ

• F_B = I/LB sinθ

• F_B = ILB