All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2008 Physics

Q. 25. A thin spherical shell of radius R has charge Q spread uniformly over its surface. Which of the following graphs most closely represents the electric field E(r) produced by the shell in the range , where r is the distance from the centre of the shell?

Sol: In this case, electric field inside the shell is zero and is inversely proportional to r², where r is the distance of a point outside the shell.

Correct answer (3)

Q. 26. A body is at rest at x = 0. At t = 0, it starts moving in the positive x-direction with a constant acceleration. At the same instant another body passes through x = 0 moving in the positive x direction with a constant speed. The position of the first body is given by x₁(t) after time t and that of the second body by x₂(t) after the same time interval. Which of the following graphs correctly describes (x₁ -x₂) as a function of time t?

Sol:

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