5) Lenz\'s law (Random Guess) According to Lenz\'s law, the induced current in a

Question

5) Lenz's law (Random Guess) According to Lenz's law, the induced current in a circuit must flow in such a direction that the induced magnetic field will oppose the change in magnetic flux. a) False, it is actually the MAGNITUDE of the magnetic flux that is opposed b) True c) I wanted to get this answer wrong so I picked "d" d) I don't know, let's try filling an irrelevant box and see what happens e) Other 6) Beat frequency (Easy) "We Got the Beat" is a song recorded by the American rock band the Go-Go's in 1980. If Charlotte Caffey (the group's lead guitarist) tuned her instrument to an "A" tuning fork (440Hz) and heard a beat frequency of 5Hz, what note(s) could her Guitar actually be plating? 7) Transformer Part-I (Easy) The input voltage to a transformer is 120V RMS AC to the primary coil of 1000 turns. What are the number of turns in the secondary needed to produce an output voltage of 10V RMS AC?

Explanation / Answer

Ans 5

B is correct , this is the correct statement of Lenz's law

Ans 6

The possible frequencies are f = 440 +5 and 440 - 5

f = 445Hz & 435 Hz

Ans 7:

Ns / Np = Vs / Vp

Ns / 1000 = 10 / 120

Ns= 1000 / 12 = 250 / 3 = 83.3 turns = 84 turns(approximately)

Ns = number of turns in secondary,. Np= number of turns in primary

Vs = voltage across secondary,. Vp = voltage across primary

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