Tell me more ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.
up vote 0 down vote favorite

My textbook (NCERT Physics Class 12th) has the following figure (Pg 212).

enter image description here

The Arm PQ is moved to the left side thus decreasing the area of the rectangular loop. This results in a decrease in magnetic flux in the Downward (inside the page) direction. Hence, according to lenz's law, the induced current should be in Clockwise direction but the book says the opposite.

Am I missing something? or is the book wrong?

share|improve this question
3  
To me it seems that the book is indeed wrong. – Joe Jan 31 at 8:10
3  
Yes, it's wrong. It's enough to see that the current pictured would induce a magnetic field directed outward, which would increase the variation of B in a positive feedback. Which is against the reason for which the "Lenz's minus" was introduced. – Bzazz Jan 31 at 10:55

1 Answer

up vote 1 down vote

I think the X's represent magnetic field going out of the page. If this is true, than the current will indeed be in the counter-clockwise direction, as the book says.

share|improve this answer
No, X'es represent the field going inside the page. – Aneesh Dogra Feb 3 at 9:11

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.