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

Physics & Space Science

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Fill in the blank(s) with correct word

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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

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A photon is

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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?

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Physics & Space Science