The distance of a point from a long straight current-carrying wire is doubled
MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Ampere's circuital law
Problem
The distance of a point from a long straight current-carrying wire is doubled. How does the magnitude of the magnetic field at that point change?
(a) It doubles.
(b) It becomes half of its original value.
(c) It remains unchanged.
(d) It becomes one-fourth of its original value.