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All Exams 3 &amp; F 1-97, some to 05

# All Exams 3 &amp; F 1-97, some to 05 - 7 Current is...

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7. Current is flowing in the direction shown. It is increasing. Show the magnetic flux in the transformer core. Show the direction of the current in the 25 resistor. If the power supply provides a sine wave of 150 v for the peak voltage, what is the number of watts dissapated by the 25 resistor?

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8. In the set up below assume gravity is acting down towards the bottom of the page. The hole is 5 m above the bottom of the chamber, which is 3.5 m wide. An electron is shot into the region between the plates at 100m/ s. What is the electric field needed to cause the electron to hit the lower left corner? Give the direction of this field.
Name___________ Exam 2x (You may "x" one problem out.) Physics 133 Fall 2005 Zammit 1. Two capacitors, 2 f and 10 f are in parallel with a 20 volt battery. The battery is removed and plates of opposite sign are connected. Find the and final energy for the 2 f capacitor.

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2. The battery has a terminal voltage of 4.8 volts when connected as below. Find its internal resistance.
3. For the circuit below, the switch is closed at time t = 0. What is the maximum power dissapated by all the resistors? What is the maximum energy stored in the capacitor? Give times when these respective events occur.

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4. F or the circuit below, find the current through the vertical 20Ω resistor.
5. Given that the headlights for a car have a resistance of 12 ohms. The car has a 12 v system. If the combustion of 1 L of gas gives 3 x 10 7 J, and the conversion is 25% efficient for the car's electrical system, how many liters of gas are consumed in one hour?

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Name___________ Exam 3 (Each problem is worth 10 points.) Physics 133 Spring 2001 Zammit 1. A rectangular loop of wire lies in the x-y plane, centered on the origin. It has a x length of 2 m, and a y length of 3 m. It has 30 turns and a current of 3 A.
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All Exams 3 &amp; F 1-97, some to 05 - 7 Current is...

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