**
Question 1
**

A long straight wire carries a current into the board. Point P lies nearly above the wire. Which direction is the magnetic field at point P?

Answer: to the right

**
Question 2
**

A long straight wire carries a current **I** into the board.
There are two circles drawn on the board, both centered on
the wire.
One has a large radius, the other a small radius.

The integral

B dot dsaround the little circle is

- greater than the integral around the big circle
- the same as the integral around the big circle
- less than the integral around the big circle

Answer: b), the same (because both circle surround the same amount of current)

**
Question 3
**

What is the value of the integral

B dot dsaround the little circle in problem 2?

Answer: mu-nought times I

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.