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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A 1.00-g cork ball having a positive charge of 2.00 mC is suspended vertically on a 0.500-m-long light siring in the presence of a uniform downward-directed electric field of magnitude E = 1.00 × 105 N/C as in Figure P15.62. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum. (a) Determine the period of the ball’s oscillation, (b) Should gravity be included in the calculation for part (a)? Explain.

images

Figure P15.62

(a)

To determine
The period of ball’s acceleration.

Explanation

Given info: Mass of the cork ball (m) is 1.00 g. Charge on the ball (q) is 2.00 mC. Length of the string (l) is 0.500 m. The magnitude of electric field (E) is 1.00×105N/C .

Formula to calculate the time period is,

T=2πlg

  • g is the acceleration.

Formula to calculate the acceleration is,

g=qE+magm=qEm+ag

  • ag is the acceleration due to gravity.

Therefore,

T=2πlqEm+ag

Substitute 1.00 g for m, 2.00 mC for q, 0.500 m for l and 9.8ms-2 for ag.

T=2π0.500m(1

(b)

To determine
The effect of gravity on time period.

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