Amount of Charge - General Physics - Past Paper, Exams of Physics

Download Amount of Charge - General Physics - Past Paper and more Exams Physics in PDF only on Docsity! St. Vincent College PH 112: General Physics II Exam V 4/19/2004 The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages. Problem 1 25 Problem 2 30 Problem 3 25 Problem 4 20 Total 100 1. (25 pts) a) (5 pts) The North pole of a magnet moves to the right towards a loop of wire. The South pole of a second magnet also moves to the right towards a second loop of wire. Compare the direction of the current induced in the two loops. Assume that the loops are in the same plane and that the magnets are moving perpendicular to the loops. b) (5 pts) When a conducting rod moves through a magnetic field, electrons accumulate at one end leaving the opposite end with a net positive charge. Explain why the amount of charge (and the potential difference between the ends of the rod) does not increase indefinitely even though the rod continues moving through the magnetic field. c) (5 pts) A current carrying wire passes near a loop of wire. Under what conditions (with respect to the current in the wire) will a potential be induced in the loop? d) (5 pts) A wire loop is in a region of space in which also exists a changing magnetic field. The charges in the wire are not initially moving, yet a current is induced in the loop. What is it that exerts a force on the (motionless) charges that starts them moving? e) (5 pts) Briefly explain why the current in a simple circuit does not immediately jump from zero to the maximum value when the switch is closed.