An electron moving with velocity V₁=2î m/s at a point in a magnetic field experiences force F₁=-2ĵ N. If it moves with velocity V₂=2ĵ m/s at the same point, it experiences force F₂=+2ĵ N. The force for velocity V₃=2k̂ m/s at the same point is:
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Question

An electron moving with velocity V₁=2î m/s at a point in a magnetic field experiences force F₁=-2ĵ N. If it moves with velocity V₂=2ĵ m/s at the same point, it experiences force F₂=+2ĵ N. The force for velocity V₃=2k̂ m/s at the same point is:

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G1 Physics · Accepted Answer

For a magnetic Lorentz force, F⃗=qv⃗×B⃗ is always perpendicular to v⃗. The second stated datum in the source has F₂ parallel to V₂, so it is internally inconsistent with a purely magnetic force. The printed source answer key marks option A (zero); the row preserves that source answer.

An electron moving with velocity V₁=2î m/s at a point in a magnetic field experiences force F₁=−2ĵ N. If it moves with velocity V₂=2ĵ m/s at the same point, it experiences force F₂=+2ĵ N. The force for velocity V₃=2k̂ m/s at the same point is: