Debbie is studying the scientific method in her physical science class. She is working on a science fair project and needs to determine the variables that she will use. Which statement could help Debbie understand the difference between a test variable (independent variable) and an outcome variable (dependent variable)? The outcome variable (dependent variable) is the control and test variable (independent variable) is the result.

The test variable (independent variable) is the result of the changes the researcher makes to the outcome variable (dependent variable). O The test variable (independent variable) is the control and the outcome variable

(dependent variable) provides the results, which are measured to gather data.

The outcome variable (dependent variable) is the result of the changes the researcher makes to the test variable (independent variable).

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 kevlar

no. dot product   =0 when vecs at right angles