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State the rule which is used to find the...

State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?

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Right hand thumb rule is used,
This rule is used to determine the direction of the magnetic field . If we rotate a right - handed screw using a screw driver, then the direction of current is same as the direction in which screw advances and the direction of rotation of the screw gives the direction of the magnetic field.
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