NEET Physics (general) MCQ Question
Which of the following statements about the magnetic field produced by a current-carrying wire are correct?
The magnetic field strength is uniform at every point in a circle with the wire at its center.
The magnetic field produced by an irregularly shaped planar coil can differ from that of a circular coil, even if they enclose the same area.
The expression for the magnetic field around a straight conductor is similar to that of an electric dipole.
A galvanometer can be converted into an ammeter by introducing a shunt resistance of high value in parallel.
Correct Answer
Detailed Explanation
Statement A is correct as it reflects the uniformity of the magnetic field at points in a circle around the wire. Statement B is misleading; while the shapes are different, the magnetic field can be similar under certain conditions. Statement C is unclear and not directly supported by the context. Statement D is incorrect because a low-value shunt resistance is used to convert a galvanometer into an ammeter.
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