1Is the coil moving forward too, or is it hinged at centre and rotating about it?
Draw the graph of the EMF vs Time for the coil given here..
The arrangement starts from rest and has a constant angular acceleration.
The half part has a radius r, the magnetic field on the right side is B
and α = constant = a
Now draw the graph of EMF vs Time
I have solved this one in the class a lot of times :) [Dont know why ;)]
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11 Answers
1
24ωi=0 ,
φi=0,
(dφ/dt)t=0=0 =>emfi=0
ANgle rotated in t time=θ=αt2/2
φ=12r2θ2B=12r2αt22B
=>emf=dφ/dt=r2αBt/2
24Now regarding graph...
polarity change when it rotates by angle π,2π....
=> Ï€=αt12 =>t1=√2πα
Similarly t2=√4πα....
62Great [1]
so far i have given this one so many times in my classes and no one ever got it right on the first attempt [1]
24well to be honest i am doing this ques for 5th time..so it was on my tips[1]
62oh is it!
i saw a much simpler variation in some book (probably vidyamandir's material) (I took its correspondence when i was myself preparing)
I gave this variant in the class and had a feeling that this question was given by me...
