A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is
A) 2 A.
B) 5 A.
C) 10 A.
D) 25 A.
E) none of the above
Answer: B
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Matter falling into a black hole converts _______________ energy into thermal energy
Fill in the blank(s) with correct word
Current: A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A. 1.5 × 1022 B. 5.1 × 1022 C. 1.8 × 103 D. 8.1 × 103 E. 1.0 × 1023
A photon is
A) a high-energy electromagnetic wave. B) an electron that has been ejected from a metal surface by electromagnetic radiation. C) a particle-like quantum of radiation. D) one of the two types of nuclear particles. E) the "anti-particle" to the electron.
A particle with a charge of +4.0 ?C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A) 4.1 × 104 N/C B) 8.2 × 104 N/C C) 4.4 × 104 N/C D) 1.2 × 104 N/C E) 5.1 × 104 N/C