Which describes time dilation?
a. the faster an object moves, the more stretched time becomes.
b. the more slowly an object moves, the more stretched time becomes.
c. the faster an object moves, the more time it takes for light to travel a given distance.
d. the faster an object moves, the less time it takes for light to travel a given distance.

A

Explanation:

The closer an object is to light speed, the slower time flows for the object

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:

continuous conducting path for current, power supply