# Question on Magentic Field

• Nimmy
In summary, the conversation is discussing the calculation of the magnetic field at the center of a square formed by four circles with Xs indicating a magnetic field direction going into the page. The question is raised as to why the magnetic field is zero, and it is explained that this is due to the canceling out of clockwise magnetic fields from each of the four corners of the square.

#### Nimmy

So I am trying to understand why the answer is zero for this problem.

Calculate the magnetic field at the center of the square.

The figure shows 4 circles with Xs (which I understand indicates, magnetic field direction is going into the page) forming into a square, if that makes any sense.

Please explain to me why the magnetic field is zero.

Are the circles with X's in the corners possibly currents all going into the page?

Or are you saying that there are 4 flux lines at each corner going into the page?

LowlyPion said:
Are the circles with X's in the corners possibly currents all going into the page?

Or are you saying that there are 4 flux lines at each corner going into the page?

The circles with the Xs in the corners are currents all going into the page.

Well then what is the magnetic field about a current in a wire?

What is the B-field from each of the currents? And more importantly how are they directed?

LowlyPion said:
Well then what is the magnetic field about a current in a wire?

What is the B-field from each of the currents? And more importantly how are they directed?

Thanks someone explained it to me...

(x)1 (x)2

(x)3 (x)4

From RIGHT HAND RULE.
So the magnetic field on 1,2,3,4 are all clockwise. So 1 will be canceling out with 3 and 2 will be canceling out with 4. Therefore, there is no magnetic field.

Nimmy said:
Thanks someone explained it to me...

(x)1 (x)2

(x)3 (x)4

From RIGHT HAND RULE.
So the magnetic field on 1,2,3,4 are all clockwise. So 1 will be canceling out with 3 and 2 will be canceling out with 4. Therefore, there is no magnetic field.

There you go. You got it.