img071 - PHY2054 Spring 2007 18 The figure shows two...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: PHY2054 Spring 2007 18. The figure shows two concentric circular wire loops. The current in the outer loop is clock- wise and decreasing at aeonstantr‘ate. The induced current in the inner loop is (CW = clockwise and CCW = counterclockwise) 08‘ @ CW, constant \i“ i a l m (2) cw, increasing V. (V) (a M Ml we, (3) CCW, decreasing (jib/CCW, constant Meow, increasing The current in the outer loop decreases at a constant rate, so the B field in the downward direc- tion is decreasing at a constant rate. By Lenz’ law, the current induced in the inner loop must be CW (to offset decrease in downward flux) and Faraday ’s law says 1% rate of chan of flux is * “‘—‘ 19. A metal rod slides along two parallel conductors at speed v = 4.9 cm/s while immersed in a uniform magnetic field B = 1.85T, as shown. If the conductor separations are as shown and the total resistance of the bar and rails is 5.69, the magnitude of the induced current (in mA) and its direction will be (CW = clockwise and CCW = counterclockwise): 2.75, CCW ( ) 5.18, CW (3) 18.0, CW (4) 15.4, CCW (5) zero induced current The inducedemfis BLv, where B = 1.85 Tis the Bfield, L = 0.17 m is the width andv = 0.049 m/s is the velocity of the bar. This yields emf = 0.0154 V. The current is 0. 0154 / 5.6 = 2.75 mA and is CCW by Lenz’ law. 20. A multi~loop coil of wire forming a closed circuit is placed within a' magnetic field. Which situations will cause a current to flow in thelcoi‘l? ‘ (A) coil rotating in constant field .. coil accelerating in constant field ' ' in variable field cod movm at constant veloci (2’)“ A only (33/ B only (4) C only (5) A, B and C ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern