The direction of torque is:
Correct answer: B. Perpendicular to the plane of F and γ
- A. Parallel to the plane of F and γ
- B. Perpendicular to the plane of F and γ
- C. Anti parallel to the plane of F and γ
- D. Is the same as that of the plane of F and γ
Explanation
Perpendicular to the plane of F and γ: This option is correct as torque is always perpendicular to the plane defined by the force vector and the position vector from the axis of rotation to the point where the force is applied (i.e., γ).
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Vector Product
The vector product, or cross product, gives a vector perpendicular to two multiplying vectors, with magnitude AB sin θ and direction set by the right-hand rule. It covers properties such as anti-commutation, area from cross products, torque and angular momentum. Unlike the dot product, its result is a vector.
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