hw16 - Physics 21 Fall, 2009 Solution to HW-16 28.48 The...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Physics 21 Fall, 2009 Solution to HW-16 28.48 The current in the windings of a toroidal solenoid is 2.400 A. There are N = 500 turns and the mean radius is r = 25 . 00 cm. The toroidal solenoid is filled with a magnetic material. The magnetic field inside the windings is found to be 1.940 T. (a) Calculate the relative permeability. (b) Calculate the magnetic susceptibility of the material that fills the toroid. (a) The magnetic field inside a tightly wound toroidal solenoid is B = K m nI = K m NI 2 r , where n is the number of turns per unit length and N is the total number of turns. Solving the last equation for K m , we get K m = 2 rB NI = 2 . 25 1 . 94 (4 10- 7 ) 500 2 . 4 = 2021 . (b) The magnetic susceptibility is m = K m 1 thus the answer is 2020. Faradays Law Consider a rectangular loop of wire with sides x and y placed in a region where a uniform magnetic field B exists (see the diagram). The resistance of the loop is R . Initially, the field is perpendicular to the plane of the loop and is directed out of the page. The loop can rotate about either the vertical or horizontal axis, passing through the midpoints of the opposite sides. (a) (multiple choice) Which changes would induce an electro- motive force (emf) in the loop? (b) Find the ux through the loop. (c) If the magnetic field steadily decreases from B to zero during a time interval t , what is the magnitude E of the induced emf? (d) If the magnetic field steadily decreases from B to zero during a time interval t , what is the mag- nitude I of the induced current? (e) If the magnetic field steadily decreases from B to zero during a time interval t , what is the direction of the induced current? (f) (multiple choice) Which changes would result in a clockwise emf in the loop?...
View Full Document

Page1 / 3

hw16 - Physics 21 Fall, 2009 Solution to HW-16 28.48 The...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online