An electron moving perpendicular to a magnetic field of 2.2 × 10-2 T moves in a circle of certain radius. If the electron is moving with a speed of 1.5 × 107 m/s, what is the radius of the circle?
A)
1.5 × 10-3 m
B)
2.2 × 10-4 m
C)
2.2 × 10-3 m
D)
3.9 × 10-4 m
E)
3.9 × 10-3 m
E
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An RL circuit has L = 0.40 H and R = 5.0 W. It is connected to a battery with e = 22 V at time t = 0 . Find the energy stored in the inductor when the current in the circuit is 2.3 A
a. 5.0 J c. 50 mJ b. 2.0 J d. 1.1 J
Resolution: The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
A. 0.43 B. 0.65 C. 2.0 D. 2.3
Two capacitors, C1 and C2, are connected in series across a source of potential difference. With the potential source still connected, a dielectric is now inserted between the plates of capacitor C1. What happens to the charge on capacitor C2?
A) The charge on C2 increases. B) The charge on C2 decreases. C) The charge on C2 remains the same.