Revision: ADVANCED PHYSICS – Electric Fields

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Advanced Physics: Electric Fields - Revision Quiz

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1) Two oppositely-charged parallel plates are arranged as shown.

An electron is released from rest from the surface of the negatively-charged plate. The electron travels from the negatively-charged plate towards the positively-charged plate.

Which graph shows how the force F on the electron varies with its distance x from the negative plate?

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2) An electron enters the space between two parallel charged plates with an initial velocity u.

While in the electric field, its direction changes by θ and it emerges with a velocity v. What is the relation between v and u?

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3) Two charges –q and +q are placed at a distance 2d apart.

What is the electric field strength at X, a distance d away from +q?

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4) The force of attraction between two unlike charges is 1.5 N. If the distance between the charges is doubled, what is the force of attraction between them?

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5) The diagram shows two plates J and K, a distance 0.080 m apart in a vacuum. An electron, originally at rest, is accelerated by a uniform electric field of 3.0 × 105 N C–1 from K to J. What is the gain in the electron‚Äôs kinetic energy? Ignore the weight of the electron and take the magnitude of the charge of the electron to be 1.60 × 10–19 C.

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