MCQ
The permanent magnetic moment of the atoms of a material is not zero. The material:
- AMust be paramagnetic.
- BMust be diamagnetic.
- CMust be ferromagnetic.
- ✓May be paramagnetic.
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$(a)$ Centre of mass of a body always coincides with the centre of gravity of the body
$(b)$ Central of mass of a body is the point at which the total gravitational torque on the body is zero
$(c)$ A couple on a body produce both translational and rotation motion in a body
$(d)$ Mechanical advantage greater than one means that small effort can be used to lift a large load

