HW #10 - Induction

# HW #10 - Induction - MasteringPhysics Assignment Print View...

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MasteringPhysics: Assignment Print View An Air-Filled Toroidal Solenoid An air-filled toroidal solenoid has a mean radius of 15.1 and a cross-sectional area of 4.99 (see the figure). The current flowing through it is 12.5 , and it is desired that the energy stored within the solenoid be at least 0.387 . Part A What is the least number of turns that the winding must have? Hint A.1 Hint not displayed Hint A.2 Hint not displayed Hint A.3 Hint not displayed Hint A.4 Hint not displayed Hint A.5 Hint not displayed Hint A.6 Hint not displayed Express your answer numerically, as a whole number, to three significant figures. ANSWER: 2740 turns Induced EMF and Current in a Shrinking Loop

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MasteringPhysics: Assignment Print View Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 170 , but its circumference is decreasing at a constant rate of 15.0 due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of magnitude 1.00 , which is oriented perpendicular to the plane of the loop. Part A Find the (magnitude of the) emf induced in the loop after exactly time 1.00 has passed since the circumference of the loop started to decrease. Hint A.1 Hint not displayed Hint A.2 Hint not displayed Hint A.3 Hint not displayed Hint A.4 Hint not displayed Hint A.5 Hint not displayed Express your answer numerically (in volts) to at least three significant digits. ANSWER: = 3.70×10 - 2 V Part B Find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field. ANSWER: clockwise counterclockwise The induced current flows in the direction that tends to prevent the flux through the coil from decreasing. That is, it adds to the magnetic field through the coil as the coil's area is decreasing.
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