Two identical point charges, A and B

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

Two identical point charges, A and B, move through space. For each charge, the velocity vector is perpendicular to the line joining the charge to point P, where the magnetic field is measured. • Charge A: speed 3.0×106 m/s3.0\times10^{6}\,\text{m/s}, distance from P 0.15 m0.15\,\text{m}. • Charge B: speed 2.0×106 m/s2.0\times10^{6}\,\text{m/s}, distance from P 0.10 m0.10\,\text{m}. What is the ratio BABB\dfrac{B_A}{B_B} of the magnetic field magnitudes at P due to charges A and B? (a) 1.51.5 (b) 0.670.67 (c) 0.440.44 (d) 1.01.0

Related theory

Browse the problem library