PHY 112 EXAM 1 NAU QUESTIONS AND ANSWERS.docx

PHY 112 EXAM 1 NAU QUESTIONS AND
ANSWERS
What is the fundamental charge (e) -
correct answer ✅The magnitude of the charge of an electron or
proton


The eV is a unit of? -
correct answer ✅enrgy


If two protons are released from rest and only electrostatic force is
acting on them, what happens to their acceleration? -
correct answer ✅Begins to decrease


Doubling the charge of a capacitor holding a constant charge causes
the energy stored in capacitor to? Formula to calculate? -
correct answer ✅Decrease
Q = (C)*(DeltaV)
Q is charge C is capacitance and Vis charge stored in capacitor


Dielectric effects in a capacitor -
correct answer ✅Decreases the Electric field and voltage and
increases capacitance

, PHY 112 EXAM 1 NAU QUESTIONS AND
ANSWERS
If length of a wire is kept the same but radius is doubles what
happens to resitience of the wire? Formula to find this? -
correct answer ✅It decreases
R = (ro)(L)/A
R is resistance L is lenght and A is area


If the resistance in a constant voltage circuit is doubled, the power
dissipated by that circuit will? Formula to find this? -
correct answer ✅Decrease by 1/2
P=V^2*R


P is power V is voltage R is resistance


a capacitor stores separated charges, but a capacitor has a potential
difference but not an -
correct answer ✅emf


When current through a resistor increases, what happens to the
dissapated power?
Formula to find this? -
correct answer ✅It increases