This time a small metal ball having a positive charge is brought near a large so

Question

This time a small metal ball having a positive charge is brought near a large solid plastic disk. The ball then touches it on the right side and is removed. Which of the following best shows the distribution of the charges after the ball is removed? A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves? They separate further. They move closer together. They are unaffected. cannot be determined without further information An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field? trajectory W trajectory X trajectory Y trajectory Z Use the following information for the next two questions: Two point charges of + 20.0 mewC and -8.00 mewC are separated by a distance of 20.0 cm. What is the electric field E midway between these two charges?

Explanation / Answer

6.

q1 = 20 x 10-6 C

q2 = 8 x 10-6 C

r = distance of each charge from midpoint = distance between charges / 2 = 20 /2 = 10 cm = 0.1 m

Net electric field = electric field by q1 + Electric field by q2

E = E1 + E2

E = k q1/r2 + k q2/r2

E =(k/r2 )(q1 + q2) = (9 x 109 / (0.1)2) (20 x 10-6 + 8 x 10-6 ) = 25.2 x 106 N/C   towards negative charge

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