Two parallel wires are separated by 0.25 m. Wire A carries 5.0 A and Wire B carries 10 A, both currents in the same direction. The force on 0.80 m of Wire A is:
a. half that on 0.80 m of wire B.
b. one-fourth that on 0.80 m of wire B.
c. toward Wire B.
d. away from Wire B.
c
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When voltage is stepped up in a transformer, current is stepped down. But Ohm's law tells us that greater voltage means greater current, not less current. How then can current be lower when voltage is increased?
A) Current in the secondary is lower when compared to the greater current drawn by the primary. B) Ohm's law applies to the circuit connected to the secondary, not to the transformer. C) both of these D) neither of these
An object is thrown upward at 5.0 m/s, and experiences only the force of gravity once thrown. One second later the object is
A. rising at 5 m/s. B. neither rising nor falling. C. falling at 4.8 m/s. D. rising at 4.8 m/s.
Increasing the separation of the two charged parallel plates of a capacitor, which are disconnected from a battery, will produce what effect on the capacitor?
a. increase charge c. decrease capacitance b. decrease charge d. increase capacitance
In the Compton effect a photon of wavelength 
and frequency f is scattered from and electron, initially at rest. In this process
A. the photon loses energy so that the scattered photon has frequency less than f. B. the momentum is not conserved, but the energy is. C. the electron gives energy to the scattered photon so that the photon's frequency is greater than f. D. the electron gains energy from the photon so that the scattered photon's wavelength is less than f.