What are two ways electromagnetic waves are used in a home computer scanner? A. Red light shines on a black-and-white object, and light is reflected according to the pattern of black and white.

B. An image is produced when a silicon chip releases electrons by the photoelectric effect.

C. X-rays shine on objects, and the rays either pass through or are absorbed by the objects.

D. Visible light is reflected off an object and then captured by a charge-coupled device.

Explanation is in the file

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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:

powerful computers now, not then