Is it true that we use the right-hand thumb rule for finding the direction of the magnetic field due to both a (current carrying) straight wire and a circular coil?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
In the right-hand thumb rule, if a current-carrying conductor is imagined to behold in your right hand, then the thumb points along the direction of the current, and the direction of the folded fingers will give the direction of magnetic field lines. It applies to a straight current carrying wire, a circular coil, and a solenoid.
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