In the field induction credited to Maxwell, wires
A) can be insulated or non-insulated.
B) are minimized.
C) are not needed.
Answer: C
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In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
A. the potential of the nearest battery is the potential at the junction. B. there are no transformations of energy from one type to another in a circuit loop. C. capacitors tend to maintain current through them at a constant value. D. current is used up after it leaves a junction. E. charge is neither created nor destroyed at a junction.
Conversion of Units: A plot of land contains 5.8 acres. How many square meters does it contain? (1.0 acre = 43,560 ft2 and 2.54 cm = 1.00 in.)
A. 2.3 × 104 m2 B. 7.1 × 103 m2 C. 7.0 × 104 m2 D. 5.0 × 104 m2
You conduct the following three ball drops, in each case measuring the time it takes for the ball to fall to the ground; the mass is the mass of the ball and the height is the height from which you drop the ball:
Ball Drop 1. Mass 0.5 kilograms, height 20 meters Ball Drop 2. Mass 5.0 kilograms, height 20 meters Ball Drop 3. Mass 0.5 kilograms, height 30 meters Which pair of ball-drops will best test whether mass affects the acceleration of gravity? A) ball drops 2 and 3 B) ball drops 1 and 3 C) ball drops 1 and 2
Magnification is greater with a lens having a
A) high index of refraction. B) low index of refraction. C) same in each