JEE Main 2022 · PhysicsMultiple choiceDiagram basedMediumData or graph
JEE Main 28 June 2022, Shift 1, Physics Q40
Question 40 of 90 in this shift, Physics question 10 of 30, Section A.
An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface.
Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder.
The figure, in words
Four graphs of B (vertical axis) against r (horizontal axis), with R marked on the r axis; described in the options.- (1)[figure: graph of B vs r; B rises as a straight line from the origin O up to r = R (dashed vertical line at R), then stays constant (horizontal line) for r > R]
- (2)[figure: graph of B vs r; B rises as a straight line from the origin O up to r = R (dashed vertical line at R), then falls as a decaying curve for r > R]
- (3)[figure: graph of B vs r; B is a constant horizontal line from r = 0 up to r = R (dashed vertical line at R), then falls as a decaying curve for r > R]
- (4)[figure: graph of B vs r; B is zero from the origin O to r = R, then at r = R (dashed vertical line) it starts at a high value and falls as a decaying curve for r > R]Official answer
Official answer
Option 4
NTA final key.
- Chapter
- Moving Charges and Magnetism
- Idea tested
- Magnetic Field of a Hollow Cylindrical Pipe