1.) A solenoid with a cross-sectional area of 1.80×103 m2 is 0.680 m long and ha

Question

1.) A solenoid with a cross-sectional area of 1.80×103 m2 is 0.680 m long and has 480 turns per meter. Find the magnitude of induced emf in this solenoid if the current in it is increased from 0 to 2.35 A in 45.0 ms . Answer should be in mV

2.)A step-up transformer has 26 turns on the primary coil and 720 turns on the secondary coil. If this transformer is to produce an output of 4300 V with a 16-mA current, what input current and voltage are needed?

Part A
Express your answer using two significant figures. Answer should be in A

Part B
Express your answer using two significant figures. Answer should be in kV

Explanation / Answer

B = NI

magnetic flux = B.Area = NIA

emf induced = NA(dI/dt) = 4*10-7*480*1.8*10-3*(2.35/45*10-3) = 0.0567 mV.

2) Voltage of secondary/Voltage of primary = turns ratio

4300/Vp = 720/26

Vp = 0.155 kV

Current of primary/Current of secondary = turns ratio

Ip/16 = 720/26

Ip = 443 mA

Ip = 0.443 A

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