1) A 12-V battery is connected to a coil. The coils resistance is 10 and its
inductance is 2 H. In what time interval will the current in the coil reach (a)
50% and (b) 90% of its final value?
2) A 140-mH inductor and a 4.9- resistor are connected with a
2A. (Parallel Plate Capacitor)
Consider a parallel plate capacitor whose plates each have an area of 2 cm2 and
which are separated by 1 mm. The capacitor is hooked up to a battery so that the
top plate is at 20 V and the bottom plate is at 5 V. The space
1) A driver travels northbound at 25 m/s. A police car, traveling southbound at 40
m/s, approaches with its siren emitting a frequency of 2500 Hz. (a) What
frequency does the driver hear the siren as the police car approaches? (b) What
frequency does the
1) A harmonic wave is traveling along a rope. The oscillator driving the wave
completes 1800 vibrations in 30 seconds. A wave crest travels 180 centimeters
in 10 milliseconds. What is the wavelength of the wave?
2) A wave is described by the function y =
1A. (Electric Force & Electric Field of Point Charges)
Three point charges are distributed in the xy-plane as follows:
q1 = - 2 C at (0,0) q2 = - 4 C at (2m,0)
q3 = + 3 C at (-1m,1m)
(a) Find the magnitude and direction of the net force acting on q1 due t
1C. (Electric Field of Continuous Charge Distribution)
Consider a charged thin rod. The rod is 10 cm long and has a net charge of -5 nC
uniformly distributed. You are to find the electric field at a point which lies outside
of the rod on the rod's long ax
4A. (Inductance and Inductors)
A dc battery is connected to a simple series RL circuit. The resistance is 50 . A
steady current is established in the circuit. The terminals of the battery are then
shorted together by a piece of metal such that the voltage
1
5B. (Sound)
A new group, The Screaming Physicists, is playing at a concert. A fan who is 5 m from the
speakers hears a bass frequency of 60 Hz at a level of 120 dB. (Ouch!) Assume that the speaker
is a perfect point source that emits sound uniformly in
3B. (Electric Motor & Magnetic Fields)
(a) An electric motor is to deliver 100 mW of average power when operating at
3000 rpm. The windings rotate in a magnetic field of 1 mT. Finish designing the
motor by specifying the number of windings, the area of th
3A. (Mass Spectrometer)
You are to finish designing a mass spectrometer to measure the mass of some
unknown atoms. A sketch of the spectrometer is shown below. The atoms are first
singly ionized by removing one electron from each atom. They are then
accel