A helium nucleus, composed of two protons and two neutrons, is in motion within a magnetic field B = 1.25 k T. Its velocity is measured at 2.0 × 10⁷ m/s, as shown in the figure below. For every situation outlined, calculate the magnetic force, denoted as F, exerted on this helium nucleus. Please present your solution in terms of its components.

• A. (i) 8.0 × 10⁻¹² j N, (ii) 6.1 × 10⁻¹² j N
• B. (i) - 8.0 × 10⁻¹² j N, (ii) 6.1 × 10⁻¹² j N
• C. (i) 8.0 × 10⁻¹² k N, (ii) - 6.1 × 10⁻¹² k N
• D. (i) - 8.0 × 10⁻¹² k N, (ii) - 6.1 × 10⁻¹² k N

Answer: (B)