- #1

talaroue

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## Homework Statement

The resistance of the loop is 0.55 Ω. At what rate the magnetic field strength increasing or decreasing? (a=8.4 cm, I=148 mA. Give answer in T/s.)

The loop is a square, so all the distances around are a=8.4 cm

## Homework Equations

dI=AdB

dI=rate of change of the flux

A=area

B=magnetic field

## The Attempt at a Solution

I found V by using Ohm's Law V=IR, which is the same as emf

but now I am lost, I feel like I need to find B, obvious reasons. Do I just use the equation

B=Uo*N*I/2R

N=1 because only 1 loop

Uo= constant

I=current

R=radius, so half of a?