Physics Questions and their answers:

Q1.

A thin glass rod is bent into a semicircle of radius r. A charge +q is uniformly distributed along the upper half, and a charge of -q is distributed along the lower half, as shown in Fig. 23-34b. Find the magnitude and direction of the electric field E at P, the center of the semicircle.

(a) The magnitude of the electric field at P is:

1.  q / (²*₀*r²)
2.  q*r² / (²*₀)
3.  -q*r² / (²*₀)
4.  q / (2**₀*r²)
5.  q*r² / (*₀)

(b) The direction of the electric field at P is:

1.  Vertically upwards
2.  Vertically downwards
3.  Horizontally to the right
4.  Straight out of the computer screen
5.  Straight into the computer screen
6.  Horizontally to the left

Answer:  2.  Vertically downwards




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