PLEASE ANSWER CLEARLY SHOWING EVERY STEP. I NEED TO HAVE CLEAR UNDERSTNADING OF

Question

PLEASE ANSWER CLEARLY SHOWING EVERY STEP. I NEED TO HAVE CLEAR UNDERSTNADING OF HOW TO SOLVE THEM. THANK YOU!

1) A step-up transformer has 10 turns on the primary coil and 500 turns on the secondary coil. If this transformer is to produce an output of 5700 V with a 12-mA current, what input current and voltage are needed?

2) The current in an RL circuit increases to 93% of its final value 2.21 s after the switch is closed.

(a) What is the time constant for this circuit?

(b) If the inductance in the circuit is 0.275 H, what is the resistance?

3) How many turns should a solenoid of cross-sectional area 0.038 m2 and length 0.29 m have if its inductance is to be 40 mH?

4) A metal rod 0.60 m long moves with a speed of 2.0 m/s perpendicular to a magnetic field. If the induced emf between the ends of the rod is 0.75 V, what is the strength of the magnetic field?

Explanation / Answer

1.Np = number of primary turns = 10 turns
?Ns = number of secondary turns = 500 turns

?Vp = primary voltage
?Vs = secondary voltage = 5700 V

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