ECU Physics 1260 Exam 2 Latest Questions and Verified Answers 2025, Exams of Physics

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When two lamps are connected in SERIES to a battery, the electrical resistance that the battery "senses" is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) [none of these] - Correct Answer A) more than the resistance of either lamp. SERIES: Reg = R1 + R2 *Req (equivalence) goes up, then the | (current) goes down* When two lamps are connected in PARALLEL to a battery, the electrical resistance that the battery "senses" is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) [none of these] - Correct Answer B) less than the resistance of either lamp. PARALLEL: Req = (1/R1 + 1/22)*-1 *Req (equivalence) goes down, then the | (current) goes up* On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in A) parallel. B) perpendicular. C) series. D) haste. - Correct Answer C) series. *Visual- look back at Chpt. 20 notes* If one resistor is lost in parallel, the circuit will not work for either bulb but if it is in series, only one headlight will fail. Magnet A has twice the magnetic field strength of Magnet B and ata certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is A) at or about 50 N. B) exactly 100 N. C) [need more information] - Correct Answer B) exactly 100 N. Newton's 3rd law applies. Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is A) relatively small. A) a magnetic field. B) an electric field. C) [both of these] D) [neither of these] - Correct Answer C) [both of these] This magnetic field is a result of "distortions" in the electric field caused by the motion of the electron. The shape of a magnetic field surrounding a current- carrying conductor is A) consistent with the inverse-square law. B) radial. C) circular. D) [all of these] E) [neither of these] - Correct Answer C) circular. *"Right hand rule" with fingers pointing. - be sure to know where the arrow is pointing.. either "into the board" or "out of the board". The direction of the force exerted on a moving charge in a magnetic field is A) in the direction of the motion. B) opposite its motion. C) at right angles to the direction of the motion. - Correct Answer C) at right angles to the direction of the motion. 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 these] E) [none of these] - Correct Answer D) [all of these] 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 these] - Correct Answer C) twice. The frequency of induced voltage in a wire coil depends on A) the frequency of current producing it. B) how frequently a magnet dips in and out of the coil. C) the number of loops in the coil. - Correct Answer B) how frequently a magnet dips in and out of the coil.