# Vector Product of Two Vectors

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2.5Vector Product of Two Vectors

## Cross (Vector) Product of Two Vectors Revision Questions

1. A force is acting at the given point in the beam shown in the figure. What is the magnitude of Moment of Force M taking place in the system? Moment of force is calculated by the equation M = F × ∆x. Take cos 530 = 0.6 and sin 530 = 0.8.

1. 48 N×m
2. 40 N×m
3. 38.4 N×m
4. 28.8 N×m

2. A 20 amps current carrying wire which is 40 cm long is placed at 300 to the magnetic field lines of induction b = 0.4 T. What is the magnetic force F acting in the wire? Take cos 300 = 0.86 and sin 300 = 0.5. 1. 8 N
2. 3.2 N
3. 1.6 N
4. 0.8 N

3. Three forces are acting on the same object placed at the origin of the coordinates system. The tip of the first force is at (1, -3, 2) and that of the second force is at (4, 0, -1). What are the coordinates of the tip of the third force vector if these three forces obey the rule of vectors' cross production?

1. (3, 9, 12)
2. (-3, -9, -12)
3. (4, 0, -2)
4. (2, -2, 0)

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