physics EM

Which of the following choices of path allow you to use Ampère’s law to find B(r).
1. The path must pass through the point r_vec.
2. The path must have enough symmetry so that B(r)x dl is constant along large parts of it.
3. The path must be a circle.
choices are....

a only
a and b
a and c
b and c

  1. 👍
  2. 👎
  3. 👁
  1. You can use amperes closed form integral on ANY closed path. To get B, the current has to pass through the surface formed by the closed path.
    Now, I don't like the answers. THe question is which choices of path allow you to ...

    Then all the answers say path MUST....
    a) I have no idea what rvec means, without some graphical reference.
    b) The path does not have to have any symetry, but it is nice if it does. In either case, you are allowed to choose any path which encloses the current.
    c) The path does not have to be a circle, but it is nice if it does.

    Did a Graduate Student write this test question?

    1. 👍
    2. 👎
    👤
    bobpursley
  2. no its a website. and that last choice doesnt make sense cause it asks which allows and that sats it must be...so is that one right? and the r_vec is is some point in the field.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    1.A line segment on a number line has its endpoints at -9 and 6 find the coordinate of the midpoint of the segment. Answer choices are A.1.5 B.-1.5 C.2 D.-3 2.find the coordinate of the midpoint of HX given that H(-1,3) and

  2. physics

    In a double-slit experiment, two beams of coherent light traveling different paths arrive on a screen some distance away. What is the path difference between the two waves corresponding to the third bright band out from the

  3. physics

    A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 80.0 m due east. Path 2 is 250.0 m due south. Path 3 is 130.0 m 30.0° south of west. Path 4 is 190.0 m 60.0° north of west. At

  4. physics 2

    A long wire carries a current of 1 ampere.Find the magnitude of the magnetic field 2 meter away from the wire.

  1. Physics

    Which law gives the force between two objects that is related to their mass and distance? Kepler's law Coulomb's law Newton's second law of motion Newton's law of gravitation*****

  2. Physics

    A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 40.0 m due east. Path 2 is 170.0 m due south. Path 3 is 120.0 m 30.0° south of west. Path 4 is 190.0 m 60.0° north of west. At

  3. Science-Chemistry

    1. What is Charles’s law? • State the definition of the law in words. • What are the assumptions of Charles’s law? • Write mathematical equations that represent the law. • What can you do with Charles’s law? •

  4. maths

    A rectangular grassyplot is 112m long and 78m broad. It has a gravel path 2.5m wide all around it on the inside. Find the area of path and the cost of constructing it at the rate of 1.80 per sq. m .

  1. physics

    The two small spheres each with mass m= 25g are hung by silk threads length L=.65m from a common point. When the spheres are given positive charge such that q1=2q2, each thread hangs stationary at theta=15 degrees from the

  2. Maths Mensuration

    The length and breadth of a park in the ratio 2:1 and its perimeter is 240 m. A path 2m wide runs inside it,along its boundary.Find the cost of paving the path at Rs 80 per square metre?

  3. Maths

    A circular pond of radius 4m has a path of width round it. Find the area of the path

  4. maths (it's urgent)

    the path of the rocket is represented by the equation y= root under(25-x)^2. the path of a missile designed to intrersect the path of the rocket is represented by the equation x = 3/2 root under (y). the value of x at the point of

You can view more similar questions or ask a new question.