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## Homework Statement

The magnetic field in a certain region is given by B=<40i-18k>T. How

much flux passes through a 5cm^2 area loop in this region if the loop

lies flat in the xy plane?

## Homework Equations

Flux=

**B**.

**A**

## The Attempt at a Solution

I got the answer (90 * 10^-4) in negative, and its in positive in the textbook at the back...

How can flux be negative and why can we drop the negative sign?