Question

How the direction of rotation of Barlow's wheel can be reversed?
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Answer 1

Answer:

When the axis of the wheel and the mercury are connected to electric cell, the circuit is completed through the axis of the wheel (when a point dips in the mercury) and the mercury. ... On reversing the direction of the current or that of the magnetic field the wheel rotates in the opposite direction

Answer 2

Answer:

The Lorentz force of the magnetic field on the moving charges in the wheel causes the wheel to rotate. ... Hence the direction of the rotation will not be changed by reversing that of the current; since the polarity of the electromagnet will also be reversed."

Explanation:

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