Hello guys. I need your help to answer and explain this question please 28) A lo

Question

Hello guys. I need your help to answer and explain this question please

28) A loop lying flat on the page has a magnetic field increasing out of the page through t, which way is the induced current through the loop? Clockwise or Counterclockwise? 26) A uniform magnetic field is applied perpendicular to the plane of a 100-turn circular Coil with a radius of 30 cm and a resistance of 0.90 ohm. If the magnetic field increases from 0.10 T to 2.1 T and the induced emf is 4V, how long did it take the magnetic field to increase?

Explanation / Answer

26) induced emf = N*A*dB/dt

==> dt = N*A*dB/emf

= 100*pi*0.3^2*(2.1-0.1)/4

= 14.14 s

28) clockwise

According to Lenz's law, the induced current apposes the change in magnetic flux that generated it.

so, the induced cuurent has to rpoduce magntic filed in to the page.so, induced currnet should be clockwise.

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