# Relationship between emf and magnetic field strength

See image below.

## Homework Equations

motional emf = induced voltage = B L v

## The Attempt at a Solution

I thought the answer would be A since there's a direct relationship between EMF and magnetic field strength. The answer is D.

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## Answers and Replies

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TSny
Homework Helper
Gold Member
Welcome to PF!

You do not have any motional emf in this problem since the coil is not moving (v = 0).

Try using the most general form of Faraday's law of induction.

Welcome to PF!

You do not have any motional emf in this problem since the coil is not moving (v = 0).

Try using the most general form of Faraday's law of induction.
Doesn't Faraday's law of induction say the same thing? that emf is related to the rate change of magnetic flux? and magnetic flux = BA cos theta

so the emf is related to the magnetic field strength?

TSny
Homework Helper
Gold Member
Doesn't Faraday's law of induction say the same thing?
I'm not sure what you mean by the "same thing" here.

that emf is related to the rate change of magnetic flux? and magnetic flux = BA cos theta
Yes, good.

so the emf is related to the magnetic field strength?
Would it be more appropriate to say that emf is related to the rate of change of B?

mingee kim
Doesn't Faraday's law of induction say the same thing? that emf is related to the rate change of magnetic flux? and magnetic flux = BA cos theta

so the emf is related to the magnetic field strength?
ropriate to say that emf is related to the rate of change of B?
Ahh, it makes sense now. Thank you!