A current-carrying infinitely long wire is ke | vedclass

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Question

(A) The magnetic field lines produced by the infinitely long straight wire are circular and centered on the wire. For any point above the wire,the mag

Vedclass · Accepted Answer

$(A, C)$

Vedclass · Answer

(A) The magnetic field lines produced by the infinitely long straight wire are circular and centered on the wire. For any point above the wire,the magnetic field points out of the plane of the loop,and for any point below the wire,the magnetic field points into the plane of the loop. Due to the symmetry of the circular loop about the diameter (the wire),the magnetic flux through the upper half of the loop is equal in magnitude but opposite in direction to the magnetic flux through the lower half of the loop. Therefore,the net magnetic flux $(\phi)$ through the entire loop is always zero,regardless of the current $i$ flowing through the wire. Since the induced emf $\varepsilon = -\frac{d\phi}{dt}$,and $\phi = 0$ at all times,the induced emf is zero regardless of whether the current is constant or changing. Thus,statements $(A)$ and $(C)$ are correct.

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