The main difference between hard and soft magnetic materials is their
(a) Remanence.
(b) Saturation magnetization.
(c) Coercivity.
(d) Resistivity
(c) Coercivity.
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An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)
A) The capacitor charges to its maximum value in one time constant and the current is zero at that time. B) The potential difference across the resistor and the potential difference across the capacitor are always equal. C) The potential difference across the resistor is always greater than the potential difference across the capacitor. D) The potential difference across the capacitor is always greater than the potential difference across the resistor E) Once the capacitor is essentially fully charged, there is no appreciable current in the circuit.
Researchers estimate that there is more total mass in the Kuiper Belt than in the asteroid belt
Indicate whether the statement is true or false
The capacitance per unit length of a very long coaxial cable, made of two concentric cylinders, is 50 pF/m. What is the radius of the outer cylinder if the radius of the inner one is 1.0 mm? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) 3.0 mm B) 2.0 mm C) 4.0 mm D) 1.0 mm E) 0.50 mm
A ball is thrown vertically upwards at 19.0 m/s. For its complete trip (up and back down to the starting position), its average velocity is:
a. 19.0 m/s. b. 9.5 m/s. c. 4.8 m/s. d. 14.3 m/s e. not given.