A series LR circuit contains an emf source of having no internal resistance, a resistor, a inductor having no appreciable resistance, and a switch
If the emf across the inductor is of its maximum value after the switch is closed, what is the resistance of the resistor?
A) 14 ?
B) 1.9 ?
C) 1.5 ?
D) 5.0 ?
Answer: B
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A geological formation that contains a suitable amount of water to be accessed for human use is called a(n) ?
What will be an ideal response?
A ball is thrown upward at an angle with a speed and direction such that it reaches a maximum height of 16.0 m above the point it was released, with no appreciable air resistance
At its maximum height it has a speed of 18.0 m/s. With what speed was the ball released? A) 25.3 m/s B) 22.2 m/s C) 33.0 m/s D) 29.2 m/s E) 36.9 m/s
Mutual Inductance: Coil A is close to, but not touching, coil B. If a steady counterclockwise 100-A current flows in coil A, what can you say about the induced current in coil B?
A. There will be no induced current in coil B. B. The current in coil B will be equal to 100 A clockwise. C. The current in coil B will be equal to 100 A counterclockwise. D. The current in coil B will be counterclockwise and less than 100 A, but not zero. E. The current in coil B will be clockwise and less than 100 A, but not zero.
An atom is excited when one or more of its electrons
A) vibrates. B) is boosted into higher energy levels. C) undergoes a frequency change. D) becomes frantic.