PHYS 2002 Exam 1 Questions and Answers Fully Solved Latest Update

PHYS 2002 Exam 1 Questions and Answers Fully Solved Latest Update How is the number of electrons calculated? - Answers total charge transferred/electrons (q/e) What does the electrostatic force of two objects dependent on? - Answers charges Do neutral objects have electrostatic force? - Answers no In conductors are valance electrons weakly or strongly bound? - Answers weakly How do you find the ending charge of 2 objects? - Answers add them then divide by 2 When charging by induction does the net charge of the sphere change? - Answers no, just separates charges on the spheres surface Like the force the electric field is a ______. - Answers vector What are the units of the electric field? - Answers force/charge (N/C) What does the electric field around a neg point charge look like? - Answers opposite of positive The more/less field lines you have per unit volume (density), the stronger the field. - Answers more What is the formula for charge density? The units? - Answers q/A (C/ m^2) Does the electric field depend on distance between 2 plates in a parallel plate capacitor? - Answers no Where does charge reside in a conductor in equilibrium? - Answers surface Charges in a conductor move around until the electric field is ____. - Answers 0 What happens when a conductor is placed in a capacitor? - Answers surface charges appear and distort electric field The electric field is always ______ to the surface. - Answers perpendicular What does the electric field describe? - Answers the force another charge q would feel What is electric flux? - Answers measure of how much field passes perpendicularly through a surface When is the flux the largest? - Answers if the electric field is perpendicular to the surface What does Gauss' law say? - Answers the flux through a closed surface is determined by the charge enclosed by the surface What are the units for electric flux? - Answers N/C m^2 Is electric force conservative or nonconservative? - Answers conservative What is the formula for work of an electric force? - Answers W= qE(Ya-Yb) Electrostatic potential energy is in what units? - Answers volts which is J/C Is electric potential a vector? - Answers no Are forces and electric fields vectors? - Answers yes Voltage is always higher at the + or - end? - Answers + Positive charges start from rest and accelerate from regions of ____ potential to regions of ____ potential. - Answers high, low Work is positive if it is _______ to the displacement. - Answers parallel As a charge moves on a equipotential surface does the electric force do work? - Answers no For larger voltage does the electric field increase or decrease - Answers increase If there is more or less space between plates will there be a higher E (electric field). - Answers less What is a dielectric? - Answers insulating material Dielectrics offer the same charge for more/less voltage. - Answers less What are units of a capacitor? - Answers Farad (Charge/Voltage) What type of current do batteries have? - Answers direct current What type of current do houses have? - Answers alternating current What are the units for resistance? - Answers Volts/Amps which are Ohms What does Ohm's law do? - Answers Relates voltage across a wire to the current through the wire What is the formula for Ohm's law? - Answers V=IR If V0 what way does the current flow? - Answers right An electrically neutral object acquires a net electric charge. Which one of the following statements concerning the mass of the object is true? (a)The mass does not change. (b)The mass increases if the charge is positive and decreases if it is negative. (c)The mass increases if the charge is negative and decreases if it is positive. - Answers The mass increases if the charge is negative and decreases if it is positive. Can electric charge move through an object? - Answers yes A rod made from insulating material carries a net charge (which may be positive or negative), whereas a copper sphere is electrically neutral. The rod is held close to the sphere but does not touch it. Which one of the following statements concerning the forces that the rod and sphere exert on each other is true? (a)The forces are always attractive. (b)The forces are always repulsive. (c)The forces are attractive when the rod is negative and repulsive when it is positive. (d)The forces are repulsive when the rod is negative and attractive when it is positive. (e)There are no forces. - Answers always attractive A proton and an electron are held in place on the axis. The proton is at x=d, while the electron is at x=-d. They are released simultaneously, and the only force that affects their motions significantly is the electrostatic force of attraction that each applies to the other. Which particle reaches the origin first? - Answers the electron, because, being less massive, it has the greater