If the diameter of a wire increases, its resistance __________
Fill in the blank(s) with correct word
decreases
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A galvanometer is a useful device in electric
A) electromagnets. B) transformers. C) generators and motors. D) meters. E) none of the above
A parallel circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
?
?
A. directly proportional to R. B. inversely proportional to R. C. directly proportional to (100 ? + R). D. inversely proportional to (100 ? + R). E. neither directly nor inversely proportional to R or to (100 ? + R).
A man lifts a 20.0-kg bucket of concrete from the ground up to the top of a 30.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building
How much work was done by the man in lifting the bucket? A) 5.88 kJ B) 600 J C) 760 J D) 6.04 kJ E) 160 J
A proton (mass = 1.67 × 10?27 kg, charge = 1.60 × 10?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB?VA.
A. +15 V B. ?15 V C. ?33 V D. +33 V E. ?20 V