Which of the following is an equation of the line that passes through the point (1,1) and has a slope of 2?

a.) y=2x-1
b.) y=2x+1
c.) y=-2x-1
d.) y=-2x+1

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⭐STRAIGHT LINES⭐

↪the slope- point form of a line is given as Y = mX + C

↪where Y and X are the point through which the line passes and

'm' is the slope of the line and c is the intercept ..

↪thus the line satisfying the point (1,1) and slope as 2

↪that is A.) Y = 2X - 1

↪here , slope = m =2

↪and substituting the points we get X= 1 and Y =1

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: