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Electrical Engineering Objective Questions { Electrostatics }

43. If an ohmmeter reading immediately goes practically to zero and stays there while checking a capacitor, the capacitor is
A. leaky
B. short-circuited
C. open-circuited
D. satisfactory
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44. Another name for relative permittivity is
A. dielectric constant
B. dielectric strength
C. potential gradient
D. none of the above
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45. Electric lines of force enter or leave a charged surface at an angle
A. of 90?
B. of 30?
C. of 60?
D. depending upon surface conditions
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46. As one penetrates a uniformly charged sphere, the electric field strength E
A. increases
B. decreases
C. is zero at all points
D. remains the same as at the surface
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47. A hollow sphere of charge does not produce an electric field at any
A. outer point
B. interior point
C. beyond 2 m
D. beyong 10 m
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48. Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow if they have
A. the same charge
B. the same energy
C. the same field on their surface
D. the same potential
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49. A charge Q1 exerts some force on a second charge Q2. A third charge Q3 is brought near. The force of Q1 exerted on Q2
A. decreases
B. increases
C. remains unchanged
D. increases if Q3 is of the same sign as Q1 and decreases if Q3 is of opposite sign
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