Phy 202 & 214 Quiz 22
Resistors March
5,
2008
1.
What is the resistance of a carbon resistor at
20 ¡ if it is a cylinder of radius 6 mm and a length of 3 m ? (Resistivity of carbon is 3 x 105
V
m, and it's Temperature
coefficient of
resistivity is -0.5 x 10-3)
2.
At 20¡ C, the carbon resistor in an electric
circuit connected to a 5 V battery has a resistance of 200 ohms.
What is the
current in the
circuit when
the temperature is - 30¡.
(Resistivity of carbon is 3
x 105 Vohm- m, and it's
Temperature coefficient of resistivity is - 0.5 x 10-3)
3.
When a parallel plate capacitor whose plates have area
2 m2
are connected to a 20 V battery the charge on the plates is 6
mC.
How far apart are the plates?
4.
Find I1, I2, & I3
in the
following
circuit.
