# Physics Q on Induction help needed

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#1
All the possible answers from A to D seems to be true to me. Need help to know which is false. Thanks!
Question is attached.
0
16 years ago
#2
D is false. at t=t2, the force is 0 (just like in C)
0
#3
I though D is true. This is my reasoning, since I is a cosine curve and induced emf is proportional to the rate of change of flux linkage which implies induced emf is proptional to the rate of change of current in A, hence induced emf will follow a sine curve. Since at t=t2, I is zero for a cosine curve but will become max for a sine curve and should be max?

0
16 years ago
#4
the force is proportional to the curent in one coil multiplied by the current in the other (just like gravitational force is proportional to the mass of one object multiplied by the mass of another object). so when either sin(t) =0 or cos(t)=0, the force will be 0, and at t=t2, sin(t) =0, therefore the force is 0, and not a maximum.
0
#5
Thanks for your explanation. I got it. 0
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