physics EM

Ive tried multiple answers but cant get it right.

Which of the following changes would induce an electromotive force (emf) in the loop? When you consider each option, assume that no other changes occur.

a. The magnitude of B_vec increases.
b. The magnitude of B_vec decreases.
c. The loop rotates about the vertical axis (vertical dotted line) shown in the diagram.
d. The loop rotates about the horizontal axis (horizontal dotted line) shown in the diagram.
e. The loop moves to the right while remaining in the plane of the page.
f. The loop moves toward you, out of the page, while remaining parallel to itself.

can be multiple options.

  1. 👍 0
  2. 👎 0
  3. 👁 94
asked by Spencer
  1. without a diagram, I cant tell what the rotations c, d, e, f do. What is needed is a loop containing a changing B field. Rotating a loop in a field does that (the amount of B*Area changes), or varying B, or moving a wire perpendicular to a field.

    Wires, or loops, moving in the direction of B wont induce an EMF>

  2. the image is a square loop on the xy plane with the B field directed into the page. that should help. Im pretty sure moving it right wont do anything because same number of field lines passing. Im not sure if changing the magnitude does anything.

    1. 👍 0
    2. 👎 0
    posted by Spencer
  3. moving it to the right wont change. Wont changing the B magnitude change the amount of flux (B*Area) in the loop?

    EMF= d/dt (B*Area)

  4. thats what i thought. so i thought it would be abc. but then wouldnt moving it in the direction of the b field cause more lines to pass in less time?
    Ive tried abcdf, abcf,abc,c, none of those work.

    1. 👍 0
    2. 👎 0
    posted by Spencer
  5. I have no idea what the direction of b is, unless you mean B, the magnetic field. In that case, no magnetic flux is changing. IF B is into the page, then f cannot be right.

Respond to this Question

First Name

Your Response

Similar Questions

  1. penn foster world history

    see ive passed Foragers,farmers,and Builders (exam 007678) & The Axial Ages And Fitful Transitions (exam 007679) but i failed Contacts,conflicts,and The Crucible (exam 007680), Convergence,divergence,and Global Enlightenments

    asked by Adrianna on October 6, 2011
  2. geog

    ive just finished my geography homework on deforestation of the amazon rainforest in brazil which damon kindly helped me with yesterday i just want to make sure ive put the right answers. this is what ive put.- pastureland cattle

    asked by Charlotte on December 14, 2008
  3. Stat HW for.

    1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

    asked by Jen N. on April 21, 2016
  4. precalc

    factor: (x-1)^1/2 - x(x-1)^-1/2 ive tried multiple different ways to firgure it out, but i cant seem to get too far in my work, i just don't know where to start.

    asked by lindsay on February 17, 2008
  5. Statistical concept 68-95-99.7

    1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

    asked by Surpreet Pororsha on April 21, 2016
  6. Fermats Little Theorem

    Good morning, Just working through an example but ive gotten stuck and need some help. So find the least residue of 8^123 Mod 61 So 8^60 = 1 (mod 61) 8^120 = (8^60)^2 = 1^2 = 1 (mod 61) 123 = 2*60+3 So 8^2*60+3 = (8^60)^2 x 8^3 =

    asked by Mat on October 15, 2016
  7. matrix, linear transformations

    Morning, Bit confused: I have been given the following: g(x,y)=(4x,6y) h(x,y)=(x+2y,y) k(x,y)=(y,x) and ive got the following matrix for each of them: g={{4,0},{0,6}} h={{1,2},{0,1}} k={{0,1},{1,0}} So ive been asked to prove the

    asked by Anon on February 25, 2017
  8. Ivytech

    There are 7 multiple choice questions on an exam, each with 4 possible answers. If you are guessing, so that you are likely to choose 1 sequence of answers as another, what is the probability of getting all 7 answers correct?

    asked by Cresha on February 5, 2014
  9. stats

    If a student answers 40 multiple choice questions, each with four possible answers, by guessing randomly, the probability that she answers at least 15 correctly

    asked by Brian on November 7, 2016
  10. probability and statistics

    a multiple choice test onsists of 8 questions, each with 4 possible answers but only one of which is correct.what is the probability that an unprepared student will, by chance, get, a. all correct answers, b. exactly 5 correct

    asked by marie on March 12, 2014

More Similar Questions