A wire loop lies in the plane of the page and a magnetic field goes through the loop perpendicular to the page and out of the page. If the area defined by the wire loop decreases, in what direction is the induced current?
a. An induced current is in a clockwise direction.
b. An induced current is in a counterclockwise direction.
2. When a resistor R1 is connected across a battery, a current of 0.12A flows through the circuit. When a second resistor is connected in series with 50Ω, the current decreases by a factor of 44. What is the voltage of the battery and the resistance of R1?
a. 17Ω
b. 25Ω
c. 50Ω
d. 75Ω
3. What power is dissipated in a circuit consisting of three 10Ω resistors connected in parallel across a 9.0-V battery?
a. The power dissipated is 270W.
b. The power dissipated is 30W.
c. The power dissipated is 24W.
d. The power dissipated is 1/24W