Homework Help: physics

Posted by physics on Thursday, March 12, 2009 at 7:09pm.

please check these for me:

When a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge?
a. it increases
b. it decreases
c. it remains the same
d. it sharply increases, and then decreases

C

A parallel-plate capacitor has a capacitance of C F. If the area of the plates is doubled while the distance between the plates is halved, the new capacitance will be
a. 4C
b. 2C
c. C/2
d. C/4

A

The energy gained by electrons as they are accelerated by an electric field is
a. greater than the average loss in energy due to collisions
b. equal to the average loss in energy due to collissions
c. less than the average loss in energy due to collissions
d. not affected by the gain in energy due to collissions

D

Which set of information will allow you to calculate the kilowatt*hr usage?
a. the voltage and current in the circuit
b. the resistance, the current, and the time the circuit operates
c. the voltage and the resistence of the circuit
d. the current and the time the circuit operates

B

thanks for all the help!

physics - drwls, Thursday, March 12, 2009 at 7:41pm
#1: wrong
#2: correct
#3: wrong. Energy gained from E-field equals energy lost in collisions, at equilibrium
#4: correct

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