John claims to have made a neutral object obtain a charge of +4x10^-19 Coulombs. Which of the following is true about this object?

None of the other choices are possible.

The object lost 2.5 protons

The object lost 2.5 electrons

The object gained 2.5 protons

The object gained 2.5 electrons

the object has lost 2.5 electrons

BU

this is contradicting with Quantization of charge

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: