Two solenoids are pan of the spark coil of an automobile. When the Current in on

Question

Two solenoids are pan of the spark coil of an automobile. When the Current in one solenoid increases from zero to 5.0 A in 3.0 ms. an emf of 25 kV,s induced in the other solenoid What is the mutual inductance M of the solenoids? 1 OH 4.0 H 7.0 H 10 H 15H The armature of a 60-Hz ac generator rotates in a 0.40 T magnetic field. If the area of the coil is 4.0 times 10^-2 m^2. how many loops must the coil contain if the peak output is to be 170 V? 28 turns 56 turns 78 turns 92 turns 112 turns Apple iPad charger pros ides 2.1 A at 5.0 V (mss). What is the current on the primary side of the coil in the charger? Assume 100 percent efficiency. 50 A 88 m A 100 m A 124 m A 176m A What is the mss current through a 10-mu F capacitor at 60 Hz and 5.0 V mss power supply? 19 m A 27 mA 35 mA 45 mA 100 mA In below circuit, what is the current I through the battery long after the switch is closed? R=21.0 Ohm L = 2.0m H, epsilon = 14.0V 10 A 8.0 A 6.0A 4.0A 2.0A

Explanation / Answer

8)
E = M* di/dt
25000 = M * (5/(3*10^-3))
25000*3*10^-3 / 5 = M
M = 15 H
Answer: e

9)
E = N*A*B*W
= N*A*B*2*pI*f
180 = N*4*10^-2 * 0.40*2*pi*60
N = 29.8

Answer: a

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