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  • A rectangular frame of wire is placed in a uniform magnetic field directed outwards, normal to the paper. is connected to a spring which is stretched to<img alt="A'B'" src="https:/

A rectangular frame of wire is placed in a uniform magnetic field directed outwards, normal to the paper. AB is connected to a spring which is stretched toA'B' and then released at time t=0. Explain qualitatively how induced e.m.f. in the coil would vary with time. (Neglect damping of oscillations of spring)

 

 
 
 
 
 

Answers (1)

The wave AB executes SHM

x=-a\cos wt

The instantaneous magnetic flux.

\phi =B.A= Blx

\phi =-Bla\cos wt

instantaneous induced emf

e=\frac{-d\phi }{dt}

    =-Blaw\sin wt

So the instantaneous emf induced varies sinusoidally.

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Safeer PP

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