Apiece of amber is charged by rubbing with a piece of fur. if the net excess charge on the fur is +8.0 nc (+8.0 10-9 c), how many electrons were added to the amber?

Number of electron on the fur will be

Explanation:

We have given net charge on the fur

Charge on one electron

Let there are n number of electrons

So

So number of electron on the fur will be

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: