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What is Maxwell's corkscrew rule? For what purpose is it used?
Maxwell's corkscrew rule: According to this rule, when a corkscrew is driven in the direction of a current, the direction in which we rotate its handle shows the direction of the magnetic field.
This rule is used to find the direction of magnetic field if the direction of current is known.
Explanation
When electric current flows vertically upwards, the direction of magnetic field produced is anticlockwise. Similarly, when electric current flows vertically downwards, the direction of magnetic field is clockwise.
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