Two ping-pong balls are painted with conductive paint. One ping-pong ball is mounted on an insulating stick; the other is hung on a string from the ceiling. The two balls are brought together such that they are barely touching (consider the initial tension to be purely vertical). Upon introducing a charged object to a ping-pong ball, charge is equally distributed to both of the balls. The hanging ball swings out from the mounted ball and eventually comes to rest. Your task is to determine the magnitude of charge on the balls given the following measurements: -A ping-pong ball has a diameter of 40mm -The hanging ball is hung from the ceiling with a 147.3cm long string. Note: this measurement is to the top of the ping-pong ball, not to the ball's center. -After charging, the two ping-pong balls have a center-center displacement of 6.40cm.

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:

their crystal patterns have been disrupted by stress

your answer is c! hope this : )