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Phy Physics

PhysicsNEB 2076 (old course)

Answer in brief, any one question. a. Bits of paper are attracted to an electrified comb, even though they have no net charge. How is this possible? [2] b. Can two electric lines of force intersect…

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Answer in brief, any one question. a. Bits of paper are attracted to an electrified comb, even though they have no net charge. How is this possible? [2] b. Can two electric lines of force intersect each other? Explain. [2] GROUP: B | B | 12

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· Based on the official syllabus and past papers
Updated
H1p 0nH: 1
A neutral hydrogen atom (proton + electron) polarized by an external electric field. The nucleus (proton) shifts slightly toward the negative plate, while the e

a. Bits of paper are attracted to an electrified comb due to electrostatic induction. When the comb is charged (e.g., by rubbing), it induces an opposite charge on the near side of the neutral paper bits and a like charge on the far side. The attractive force between the comb and the opposite induced charge on the paper is stronger than the repulsive force between the comb and the like induced charge on the far side. This net attraction pulls the paper bits toward the comb, even though the paper itself remains electrically neutral overall.

b. No, two electric lines of force cannot intersect each other. Each line of force represents the direction of the electric field at a point. If two lines intersected, the electric field would have to point in two different directions at that point, which is physically impossible. Electric field lines are continuous, smooth curves that originate from positive charges and terminate at negative charges (or extend to infinity). Their non-intersecting nature ensures a unique direction of the electric field at every point in space.

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