A point charge of 5.0 × 10–7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

The magnetic force on a moving charge is F = |q|vB sin θ. The charge moves to the right while the field points into the screen, so they are perpendicular and sin θ = 1. Thus F = (5.0 × 10⁻⁷ C)(2.6 × 10⁵ m/s)(1.8 × 10⁻² T) = 2.34 × 10⁻³ N, which rounds to 2.3 × 10⁻³ N. The correct choice is B.

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