The table below shows the approximate distances of two stars from earth. picture of table: a scientist uses a space telescope to photograph the two stars. which of these is a correct conclusion about the photographs of the two stars as taken by the scientist? (1 point) select one: a. it takes more than 10 years to photograph sirius. b. it takes more than 10 years to photograph epsilon eridani. c. the photographs show a more recent picture of sirius than epsilon eridani. d. the photographs show a more recent picture of epsilon eridani than sirius.

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:

a electromagnetic waves