Question

In: Physics

In each of the following, give the direction of the thing asked about, or “zero” if...

In each of the following, give the direction of the thing asked about, or “zero” if it’s zero. Explain your choices.(a) [1 pts.] The magnetic field between the poles of this magnet.(b) [4 pts.] The magnetic field produced by this wire (carrying current in the direction of the arrow) at the point marked “×”(c) [5 pts.] The torque (clockwise or counterclockwise) on this current loop The line with the arrow pointing up and right is a wire that is above the page,the line with the arrow pointing down and left is a wire that is below the page,current flows out of the page in the bottom wire, into the page in the top wire.The magnetic field points toward the right.(d) [4 pts.] The emf (clockwise or counterclockwise, or zero) induced in this square loop of wire attached to a pendulum, as it swings into the magnetic field. The field is directed into the page.(e) [4 pts.] The emf induced in the same loop when it is going through the bottom of its swing, completelyin the magnetic field.(f) [4 pts.] The emf induced in the same loop as it swings up out of the magnetic field.(g) [4 pts.] The emf induced in the same loop if it is hanging straight down at rest in the magnetic field.(h) [4 pts.] The emf induced in the same loop if it is hanging straight down at rest in the magnetic field and then we suddenly turn the magnetic field off.

Solutions

Expert Solution

1)Always from north pole to south pole

2)means currenty is directed into the page so, magnetic field direction must be clockwise according to right hand rule in which thumb shows the direction of current and rolling finger shows the direction of magnetic field.

3) So the direction torque is perpendicular to current dircetion and magnetic field

as

4) emf must be in direction of reducing the cause of change of flux so when pendulam swings then ares from which flux passes reduces so induced current must be in the clockwise direction as flux is flowing into the page. In order to oppose the change

5) so again to oppose the change of flux current must be the counterclockwise direction as flux is flowing out of page

6) so if loop is at rest means no change in flux so emf induced is zero.

7) noiw magnetic field is sudden decreseing means flux decreases so in order to oppose the change current will flow in clockwise direction if magnetic field is into the page or vice versa.


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