Find the force that the magnetic field applies on the wire

[zade70]

Homework Statement

Find the force that the magnetic field with B=10^-2 T applies on the wire with length 20 cm when it forms with the force the angle 30 grades when in it passes the intensity 5A.

Homework Equations

F=B*I(intensity)*l(length)*sin alpha

The Attempt at a Solution

F=10^-2*5*0.2*0.5=5*10^-3
The solution in my book is 3.5*10^-3N

 

[drvrm]

Find the force that the magnetic field with B=10^-2 T applies on the wire with length 20 cm when it forms with the force the angle 30 grades when in it passes the intensity 5A.

Homework Equations

i think by intensity 5A you mean the current through the wire.
the other angle given "when it forms with the force the angle 30 grades" what grades signifies- see conversion of grades to degree.

 

[zade70]

i think by intensity 5A you mean the current through the wire.
the other angle given "when it forms with the force the angle 30 grades" what grades signifies- see conversion of grades to degree.

yes the current through the wire is 5 A and 30 grades=pi/6 radian

 

[drvrm]

yes the current through the wire is 5 A and 30 grades=pi/6 radian

So , one grade =pi/180 radians, then why one uses a different names-give reference

 

[zade70]

So , one grade =pi/180 radians, then why one uses a different names-give reference

I translated it. but the angle is pi/6 radian

 

[zade70]

So , one grade =pi/180 radians, then why one uses a different names-give reference

If you understood the problem, could you tell me if I have done it correctly because my solution is different from the one in the book

 

[drvrm]

If you understood the problem, could you tell me if I have done it correctly because my solution is different from the one in the book

well i looked for the unit grade as angle measurer
The gradian is a unit of measurement of an angle, equivalent to 1⁄400 of aturn,[1] 9⁄10 of a degree or π⁄200 of a radian.

It is also known as gon (from Greek γωνία/gōnía for angle), grad, or grade. In continental Europe,
see details
https://en.wikipedia.org/wiki/Gradian

so if you use the conversion does the result change?

 

[drvrm]

Find the force that the magnetic field with B=10^-2 T applies on the wire with length 20 cm when it forms with the force the angle 30 grades when in it passes the intensity 5A.

the underlined statement is also to be clarified- paste a copy of the original problem.

 

[zade70]

http://tinypic.com/view.php?pic=xcnj0n&s=9#.Vw0EfJx95kg

well i looked for the unit grade as angle measurer
The gradian is a unit of measurement of an angle, equivalent to 1⁄400 of aturn,[1] 9⁄10 of a degree or π⁄200 of a radian.

It is also known as gon (from Greek γωνία/gōnía for angle), grad, or grade. In continental Europe,
see details
https://en.wikipedia.org/wiki/Gradian

so if you use the conversion does the result change?

We use this kind of relationship in physics everyday. I'm sure that the angle is pi/6 radian

 

[zade70]

the underlined statement is also to be clarified- paste a copy of the original problem.

http://postimg.org/image/tk7177rg7/
In this image Intensity is 5 Amper, the angle is pi/6 radian