# Make an electroMatnetic with formula

1. Jul 19, 2011

### baby_1

Hello
i want to create an electromagnetic with rounding the wire such as ithttp://education.jlab.org/qa/em_02.jpg" [Broken]

could you tell me how can i do it with formula?(because i want to calculate voltage , amper, Number of rounding and the material of wire)

Last edited by a moderator: May 5, 2017
2. Jul 19, 2011

### gsal

you need to know the resistance of the wire either on a per-unit-length basis or simply measure the resistance of how much wire you are using. You need an ohm-meter for this.

the relationship between voltage, amperes and resistance is this:

V = IR

V=voltage in volts
I= current in amperes
R = resistance in ohms

If you are planning on using a 1.5V battery, then I = 1.5/R, for example.

3. Jul 19, 2011

### baby_1

Thanks gsal
i know the ohm equation
i want to design a DC electronic magnate such as picture that you see.i need equation of calculation of my purpose.

4. Jul 19, 2011

### Drakkith

Staff Emeritus
5. May 1, 2012

### baby_1

Thanks
could you tell me the relationship between B(magnetic filed) and F(Netwon)? i want to move an 2kg with magnetic force