What is the sum of 1.53 + 2.786 + 3.3?
A) 8
B) 7.6
C) 7.62
D) 7.616
E) 7.6160
B
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Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
A. 51 ?T B. 33 ?T C. 72 ?T D. 64 ?T E. 46 ?T
A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
a. the coil acts like a transformer. b. the changing magnetic field induces an electric field in the wire. c. an electromagnetic wave is generated. d. the wire is ferromagnetic. e. none of the above
A 120-V rms voltage at 1000 Hz is applied to an inductor, a 2.00-?F capacitor and a 100-? resistor. If the rms value of the current in this circuit is 0.680 A, what is the inductance of the inductor?
A) 34.2 mH B) 35.8 mH C) 11.4 mH D) 17.9 mH E) 22.8 mH
A series of possible particle processes are listed below. Which (if any) are probably not processes mediated by the weak interaction? (Note: ? = a photon, ? = a muon, which is a lepton like the electron but heavier. Don’t worry about conservation of energy.)
A. 
B. 
C. 
D. 
E. All might be weak processes.