# Electromagnet within a coil

1. Apr 23, 2010

1. The problem statement, all variables and given/known data

Hooking up voltage to a solenoid (coil of wire) creates an electromagnet. Moving the electromagnet in and out of a larger coil hooked up to a galvanometer creates an emf (voltage) in the larger current.

Does an emf get created for a *stationary* electromagnet inside a larger coil of wire?

2. Relevant equations

Voltage generated = $$-N\frac{\Delta(BA)}{\Delta(t)}$$

3. The attempt at a solution

My attempt at the solution included burning 3 resistors. I hooked up 6VDC to a 10 ohm resistor in series with the smaller coil (electromagnet). Before I could count to five, the resistor was glowing hot. I increased the resistor to 27 ohms and the same thing happened (twice).

So, afraid of getting kicked by my professor, I wasn't able to directly see what was happening with a stationary electromagnetic coil inside the larger solenoid. Should the galvanometer's needle move when the electromagnet is stationary and not moving?

2. Apr 23, 2010

### xcvxcvvc

Could you predict what will happen with the equation you wrote down?