what is one advantage of using primary sources when doing research on an
experiment?
a. they are written by the scientists who did the experiment.
b. they you get the main ideas faster.
c. they include the opinions of many scientists.
d. they are summaries of many scientists' work.
shirasit

Primary sources are the records written by the the scientists regarding their own experiments.

Option A

Explanation:

Primary sources are the direct or first-hand snippets written by the scientists on their own based on their experiments that would help in providing additional evidence to the research. Using primary source help in thinking critically and analytically with respect to the research.

It helps in exploring with several perspectives that would result in figuring out additional data. Primary data supports in coping with the contradictions. It acts as an evidence for the data since it is the direct resource related to the experiment.

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:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this