Find the resultant in the x-direction , rx and y-direction , ry for f1 = 2.5n in the positive x-direction f2 = 1n in the negative x-direction f3= 2n in the positive y-direction f4=3n in the negative y-direction

466.67 s or 7.78 min

Explanation:

Applying,

E = LdI/dtEquation 1

Where E = Energized E.m.f in the solenoid, dI = change in current, dt = change in time.

make dt the subject of the equation,

dt = Ldi/E Equation 2

Given: L = 5.6 H, dI = 100-0 = 100 A, E = 1.2 V

Substitute into equation 2

dt = 5.6(100)/1.2

dt = 560/1.2

dt = 466.67 s

dt = (466.67/60) min = 7.78 min

Hence, it takes 466.67 s or 7.78 min for the solenoid to reach its operating current.