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(a) ... resistance is ___________ (proportional or inversely proportional?) to current if voltage is held constant.
(b) ... current is ___________ (proportional or inversely proportional?) to voltage if resistance is held constant.
(c) ... voltage is ___________ (proportional or inversely proportional?) to resistance if current is held constant.
2. If you constructed either of the circuits from this lab in real life, and you allowed the current to run for a very long time, the circuit components would heat up. How would this affect the measurement of the current? Assume carbon resistors. (Hint: You will need to look up the temperature coefficient of resistivity for carbon.)
2. When a capacitor, charged to a p.d. of 400 V, is connected to a voltmeter having a resistance of 25 M-Ohm, the voltmeter reading is observed to have fallen to 50 V at the end of an interval of 2 minutes. Find the capacitance of the capacitor.
Two charges Q1 = +3nC and Q2 = -4nC are separated by a distance of 50 cm. What is the electric field strength at a point that is 20 cm from Q1 and 30 cm from Q2? The point lies between Q1 and Q2.
Two point charges form a right-angled triangle with the point A at the origin. Their charges are Q2 = 6 x 10-9 C = 6 nC and Q3 = -3 x 10-9 C = -3 nC. The distance between point A and Q2 is 5 x10-2 m and the distance between point A and Q3 is 3 x 10-2 m. What is the net electric field measured at A from the two charges?
The resistance of a resistor is 10 ohm and the current going through the resistor is 4 A. What is the potential difference (voltage) across the resistor?
the force between two charges is 125 N. One has a positive charge of 2.0 X 10-3 C, while the other has negative charge of 3.6 X 10-4 C. How far apart are the two charges?
what is the magnitude of current that flows across a 9-V battery connected to a resistor 15ohm? how long it will take a charge of 30 C to pass a cross section in a circuit? calculate the power rating.
