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Q.

Provide a rule for finding the field direction near a current-carrying straight conductor.

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a

Cork rule

b

The thumb rule on the right

c

Swimming rule

d

Flemings rule

answer is B.

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Detailed Solution

Apply the right-hand thumb rule to determine the direction of the magnetic field near a current-carrying conductor. 

If the right hand's thumb points in the direction of current flow, the curl fingers point in the direction of the magnetic field, according to the right-hand rule.

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Provide a rule for finding the field direction near a current-carrying straight conductor.