Question 1 This is slowing the flow of electrons (the current) and where some of the electrons' energy gets converted into heat. question 2 These stop the electricity from flowing (think rubber and glass).

question 3 This is a flow of electrons (such as the flow of electrons in a wire to light up a lamp).

question 4These allow electricity to flow easily through them (think copper and aluminum).

1. Electric Current

2. Resistance

3. Conductor

4. Insulator

coil wire, increase current, put iron inside the coil

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

e/c, where e is its total energy