Solenoids

If you hold a strong magnet near a current carrying wire where will the wire move?

Toward or away from the magnet

Who is Ampere’s law named after?

French physicist Andre-Marie Ampere

What do we use Ampere’s law for?

To determine what the magnetic field around an object looks like

What does Amerpian loops help us observe?

How the magnetic field changes along the loops

What is the expression of Ampere’s law?

B(2πr) = μ0I

In Amperes law what is I?

The current passing through the Amperian loop

What is B in Amperes law?

The magnetic field

What is 2πr in amperes law?

The length around the Amperian loop

What do we get when solving for B in Amperes law?

B (2πr) = μoI/2πr

How does the magnetic field from a long straight wire vary with distance ( r ) ?

The magnetic field from a long straight wire varies inversely with distance (r )

What is the constant of Amperes law called?

The permeability of free space

What is a solenoid?

A wire bent into multiple loops on top of each other

What does the magnetic field of a solenoid look just like?

The magnetic field of a bar magnet

Using Ampere’s law what is the expression for the magnetic field inside of a solenoid?

B = μoI (N/L)

In the equation for the magnetic field inside of a solenoid what does L represent?

The length of the solenoid

What does N represent in the equation for the magnetic field in a solenoid?

Number of loops

The solenoid in an MRI machine produces a magnetic field between how many Teslas?

1-2 Teslas

Where and when did an incident involving an MRI happen?

A hospital in Redwood City in 2013