4. Four resistors are connected in parallel across a 9.20−V battery. They carry currents of 150mA, 45.0mA,14.0 mA, and 4.00 mA.

Coulomb’s law tells us that the electrostatic force between two charged objects can be calculated by: ?= ??1?2/?^2Where k is a constant with a value of 8.99x109 Nm2/C2; ?1 and ?2 are the charges of the two particles (1.602x10-19 C), and r is the distance between the two particles. The force is attractive if the charges of the two particles is opposite (one’s positive and one’s negative) and repulsive if the charges have the same charge (both positive or both negative). Calculate the electrostatic force on proton #1 from the other two protons.Will the gravitational force between the protons be attractive or repulsive? What about the electrostatic force? Which has the larger magnitude, the electrostatic force or the gravitational force? Can the electrostatic and gravitational forces alone create a stable Lithium nucleus?

17. A person in bare feet is standing under a tree during a thunderstorm, seeking shelter from the rain. A lightning strike hits the tree. A burst of current lasting 40.0 μs passes through the ground; during this time the potential difference between his feet is 29.7 kV. If the resistance between one foot and the other is 520 Ω, how much energy is dissipated in his body by the lightning? _____J

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A 9v battery passes 1 mA current through a circuit for 10 minutes. what work was done by the batter (1ma=10^-3A) a. 5.4J B. 0.015 MJ c.0.009J d.6.7J e. 0.9j