Two stationary point charges q_1 and q_2 are shown in the figure along with a sk

Question

Two stationary point charges q_1 and q_2 are shown in the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch? A) q1 is negative and q2 is positive: the magnitudes are equal. B) q1 and q2 have the same sign: the magnitudes are equal. C) q1 is positive and q2 is negative: the magnitude of q1 is greater than the magnitude of q2. D) q1 is negative and q2 is positive: the magnitude of q1 is less than the magnitude of q2. E) q1 and q2 have the same sign: the magnitude of q1 is greater than the magnitude of q2. An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance? A) C/4 B) C/2 C) 2C D) 4C Which one of the diagrams below is nor a possible electric field configuration for a region of space which does not contain any charges? An air-filled 20-mu F capacitor has a charge of 60 mu C on its plates. How much energy is stored in this capacitor? A) 70 mu J B) 80 mu J C) 90 mu J D) 100 mu J E) 110 mu J

Explanation / Answer

1 --> (C) because electric field flow from + to - charge .Magnitude of q1 is higher because electric field lines are more dense at q1.

2--> (D) Capacitance = 0 * A / d

3-->(D) electric field never cut each other.

4-->(C) energy = 1/2(q^2)/C

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