I have been trying to find the name of this toy for a while now, it is my by far my favorite toy, I used to have two of them but I lost one. I will describe it as best as I can. It is a little spaceman type figure about 2 1/8 inch tall. Its head has a black spaceman type helmet on that has...

Classify materials according to their magnetic properties

I have replaced the magnetic seal on my very old Montgomery Ward fridge and I'm having problems getting the door to close. When the top of the door is making contact with the fridge, I have about a 1" gap at the bottom. The door will close with some help, but won't stay closed as the strip...

If a magnetic flux passes through a circular coil when its diameter is D, what should be its diameter (in terms of D) so that only half as much flux passes through it in the same field? Assume that the magnetic field is uniform over the area in both cases.