Answer:
Explanation: forces can cause an object to rotate and the turning effect of the force is called a moment. If a resultant force acts on an object about a fixed turning point it will cause the object to rotate e.g. turning a with a spanner, applying a screwdriver, opening a door fixed on
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Answer:
Manganese (iv )oxide is a slow depolarizer and polarization occurs with a large current, on resting, the depolarization returns the p.d of the dry cell.
It mainly depends on its wavelength