Assertion (A) :- The lines of magnetic field round a straight current carrying conductor are in the shape of concentric circles. Reason (R) :- The direction of magnetic field produced by a straight wire carrying current can be obtained by Maxwell's right hand thumb rule. (a) Both A and R are true and R is correct explanation of the assertion,(b) Both A and R are true but R is not the correct explanation of the assertion,(c) A is true but R is false,(d) A is false but R is true.
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