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Gemy4

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## Homework Statement

A flat coil of wire consisting of 20 turns, each with an area of 50 cm^2 is positioned so that the normal to its plane is at the angle of 30 degrees to a uniform magnetic field that increases its magnitude at a constant rate from 2.0T to 8.0T in 2.0 s.

## Homework Equations

Induced EMF(E)= -rate of change of magnetic flux/ change of time

## The Attempt at a Solution

Induced EMF(E)= rate of change of magnetic flux/ change of time

or = (N)(Change of B)(A)(COS Theta)/ Change of Time

N=20

A= 50 cm^2

Change of Time= 2.0 S

COS 30 degrees= .87

Change of B= 8.0T-2.0T=6.0T

The solution as posted by the teacher was,

Induced EMF(E)= (20)(6.0T)(.005M^2)(.87)/ 2 s

= .260 V

**I do not understand how 50 cm^2 becomes .005M^2**

also what happened to the negative sign?

also what happened to the negative sign?

Thank you!

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