PHYS 1260 Exam 2 Study Questions and Answers Top Graded 2024

Circuits - any path along which electrons can flow from the negative terminal to the positive terminal is Series Circuit - forms a single pathway for electron flow between the terminals of the battery, generator, or wall outlet Parallel Circuit - forms branches, each of which is a separate path for the flow of electrons Series Characteristics - -electric current through a single pathway -total resistance to current is the sum of individual resistances -current is equal to the voltage supplied by the source divided by the total resistance of the circuit -the voltage drop across each device are proportional to its resistance -if one device fails, current in the entire circuit ceases Parallel Characteristics - -voltage is the same across each device -the total current in the circuit divides among the parallel branches, the amount of current in each branch is inversely proportional to the resistance of the branch -the total current in the circuit = the sum of the currents in its branches -as the number of parallel branches is increased, the overall resistance of the circuit is decreased -a break in one path does not interrupt the flow of charge in the other paths Magnetic Poles - give rise to magnetic force (two types: N and S) Rules for Magnetic Forces b/w Magnetic Poles - -like poles repel; opposites attract -in all magnets--can't have one pole without the other -no single pole known to exist Series and Parallel - circuits are connected in what two common ways? Continuous - complete circuit allows ________ flow of electrons with no openings or gaps B) how frequently a magnet dips in and out of the coil - The frequency of induced voltage in a wire coil depends on A) the frequency of a current producing it B) how frequently a magnet dips in and out of the coil C) the number of loops in the coil C) twice - When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is A) half B) the same C) twice D) four times as much E) none of the above D) All of the above are correct - When a change occurs in the magnetic field in a closed loop of wire: A) a voltage is induced in the wire B) a current is created in the loop of wire C) electromagnetic induction occurs D) All of the above are correct E) None of the above are correct A) electricity and magnetism - Electromagnetism unites: A) electricity and magnetism B) electric and gravitational fields C) physics and biophysics D) all of the above E) none of the above