9 - Induction

# 9 - Induction - Physics 8B 9 Induction rev 4.0 9 Induction...

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Physics 8B 9 – Induction rev 4.0 1 9 – Induction 1. A bar magnet is near a solenoid as shown. For each of the situations a) - h) below, state whether the current flows from left to right, from right to left, or that there is no current flowing through the ammeter, and explain your reasoning. a) The north pole of the magnet is moved (right) towards the solenoid. b) The magnet is held stationary in the solenoid. c) The north pole of the magnet is removed (left) from the solenoid. d) The magnet is flipped and the south pole of the magnet is moved (right) towards the solenoid. e) The south pole of the magnet is removed (left) from the solenoid. f) The north pole is held stationary as above, and the solenoid is moved to the right. The north pole is held stationary and the solenoid is moved to the left. h) Both the magnet and the solenoid are moved to the right with the same speed. 2. A bar magnet is dropped through a loop of wire as shown. Looking at the loop from above, a) What is the direction of the current as the magnet enters the loop from the top? b) What is the direction of the current as the magnet as it leaves the loop from the bottom? c) What is the direction of the current at the instant it is in the middle (half above and half below S N Ammeter S N Physics 8B 9 – Induction rev 4.0 2 3. A small square loop is next to a current carrying wire as shown. For each of the situations a) - d) below, state whether the current induced in the loop is clockwise, counterclockwise, or no current is induced. Explain your reasoning. a) The current in the wire is increased. b) The loop is moved up the page. c) The loop is moved to the right. d) The loop is rotated clockwise ! turn. (see side view, but answer for top view) 4. A conducting rod makes contact with the metal rails which are a distance L = 50 cm apart in a uniform magnetic field B = 1.0 T into the page as shown. There is a resistor in the circuit R = 4.0 " . An applied force is moving the rod to the left at a constant velocity of v = 8.0 m/s.

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## This note was uploaded on 09/18/2011 for the course PHYSICS 8B taught by Professor Shapiro during the Fall '07 term at Berkeley.

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9 - Induction - Physics 8B 9 Induction rev 4.0 9 Induction...

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