Q88 / 90 · KVPY 2016 (SB/SX) · Physics

Physical processes are sometimes described visually by lines. Only the following can cross -

A
Streamlines in fluid flow
B
Lines of forces in electrostatics
Correct answer
C
Rays in geometrical optics
D
Lines of force in magnetism

Solution

$\mathrm{A} \Rightarrow$ If stream lines intersect then there will be two direction of fluid flow at a point, which is absurd. $\mathrm{B} \Rightarrow$ Lines of forces in electrostatic never intersect $\mathrm{D} \Rightarrow$ Line of force in magnetism never intersect each other.

Hence, the correct answer is option: 'C'.

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