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    				| 1. | Physical processes are sometimes described visually by lines. Ouly the following can crossA Streamlines in fuid flowB. Lines of forces m electrostaticsC. Rays n geometrical opticsD Lines of force m magnetism. | 
| Answer» Only the rays in geometrical optics can cross. The lines of forces in electrostatics represent the electric field and if they cross it would mean that there are two values of electric field at a point which is not possible. In magnetism, the lines represent the direction of magnetic force as well as tangent to streamlines in fluid represent the direction of flow. Hence, they cannot intersect. | |