Which answer choice is correct about the pictures? Student 1: The lightning does not belong in the group because it uses human-harnessed energy for electricity. It does not utilize naturally-occurring electricity.
Student 2: The image of the sock does not belong because it is clinging to the clothes due to static electricity, while all of the other images are examples of current electricity.
Student 3: The image of the electrical outlet does not belong because it is the only example of human-harnessed electricity.
Student 4: The image of the sock does not belong because the dryer created the cling, and since humans use electricity to power dryers it is an example of human-harnessed electricity.

which statement about this sum is true? −245+2.7

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:

because if the tool that you are using is not balanced it there would be false mass.

snell's law

refractve index = sin incidence / sin refraction