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August 1, 2015

Homework Help: physics

Posted by physics on Tuesday, March 17, 2009 at 6:32pm.

please tell me if thsi si correct
Two equal charges are seperated by 3.7 * 10^-10 m. the force between the charges has a magnitude of 2.37 * 10^-3 N. What is the magnitude of q on the changes?

f=1/4pi Er * q^2/r^2

2.37 * 10^-3 = 9*10^9 * q^2
______________
(3.7 * 10^-10)^2

3.61 * 10^-32= q^2
q= 1.8 * 10^-16
is that correct?


What is the resistance of a resistor if the potential difference across the resistor is 4.0 V when a current of 10.0 A flows through the resistor?

R=V/I= 4/10

R=0.4 ohms

is this done correctly

thanks

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