3. 1. (10) What is the magnitude and direction of magnetic field at point P due

Question

3.

1. (10)   What is the magnitude and direction of magnetic field at point P due to the current in the loop?

   4.7 x 10-3 T out of page.

   4.7 x 10-5 T out of page.

   4.7 x 10-3 T into the page.

   4.7 x 10-5 T into the page.

4.

1. When a metal bar is pushed to the right in a metallic rectangular rail a current flows as shown in the figure. The rail is on a magnetic field that is not shown. The magnetic field must point?
Up along the metal bar.Down along the metal bar.Out of the screen.Into the screen.


2. The diagram show the direction of magnetic field generated inside a solenoid due to the flow of current. What is the direction of the current in this solenoid, as viewed from the right side of the sketch?
In the opposite to magnetic field. Counter clockwise. In the direction magnetic field. Clockwise.

Explanation / Answer

1)

from lenz law = emf = -(d/dt)(flux)

the current flows to oppose the change in flux

as the bar moves right the flux decreases.

the magnetic field is pointing into the screen

++

2)

from thr right curl rule

the current is in counterclock wise direction

++++++++++++

4) i = e/R = B*vl/R

B = iR/vl

B = (40*10^-3*0.36)/(4*2) = 1.8 mT

5)

for transformer Pout = Pin = 120 kW

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