A long vertical copper wire passes through a horizontal cardboard sheet at point O…
PHYSICS · Multi-part · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
A long vertical copper wire passes through a horizontal cardboard sheet at point O and carries a steady current of 3 A vertically upward.
(a) Define magnetic field lines.
(b) Describe and sketch the pattern of magnetic field lines that would be observed on the sheet when iron filings are lightly sprinkled around O.
(c) Explain how the orientation of these field lines will change when the current is reversed while keeping its magnitude the same.