The drawing shows that a uniform magnetic field is directed perpendicularly into

Question

The drawing shows that a uniform magnetic field is directed perpendicularly into the plane of the paper and fills the entire region to the left of the y axis. There is no magnetic field to the right of the y axis. A rigid right triangle ABC is made of copper wire. The triangle rotates counterclockwise about the origin at point C. What is the direction (clockwise or counterclockwise) of the induced current when the triangle is crossing the following locations?

(a) the +y axis

(b) the ?x axis

(c) the ?y axis

(d) the +x axis

Why? Can you please explain? Thanks.

The drawing shows that a uniform magnetic field is directed perpendicularly into the plane of the paper and fills the entire region to the left of the y axis. There is no magnetic field to the right of the y axis. A rigid right triangle ABC is made of copper wire. The triangle rotates counterclockwise about the origin at point C. What is the direction (clockwise or counterclockwise) of the induced current when the triangle is crossing the following locations? (a) the +y axis (b) the ?x axis (c) the ?y axis (d) the +x axis Why? Can you please explain? Thanks.

Explanation / Answer

a ) As the triangle is crossing the +y axis, the magnetic fluxdown into the plane of the paper is    increasing,
By applying second right hand rule an induced magnetic field will be created within the loop by a counterclockwise induced current

(b) As the triangle is crossing the -xaxis, there is no flux change , there is no induced magnetic field, and no induced current

(c) As the triangle is crossing the -yaxis, the magnetic flux down into the plane of the paper is   decreasing,

  applying second right hand rule an induced magnetic field will be created within the loop by a clockwise induced current

(d) As the triangle is crossing the +x axis, there is no fluxchange, there is no induced magnetic field,

and no induced current appears

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