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(D) The induced $emf$ in a moving conductor is given by $\varepsilon = Blv$. Here,$B = 0.6 \ T$,$l = 5 \ cm = 0.05 \ m$,and $v = 1 \ cm/s = 0.01 \ m/s

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(D) The induced $emf$ in a moving conductor is given by $\varepsilon = Blv$. Here,$B = 0.6 \ T$,$l = 5 \ cm = 0.05 \ m$,and $v = 1 \ cm/s = 0.01 \ m/s$. Thus,$\varepsilon = 0.6 	imes 0.05 	imes 0.01 = 3 	imes 10^{-4} \ V$. $1$. From $t = 0$ to $t = 5 \ s$,the loop enters the magnetic field. The front edge is in the field,so an $emf$ is induced. $2$. From $t = 5 \ s$ to $t = 20 \ s$,the entire loop is inside the magnetic field. The magnetic flux through the loop is constant,so the induced $emf$ is $0$. $3$. From $t = 20 \ s$ to $t = 25 \ s$,the loop exits the magnetic field. The back edge is in the field,inducing an $emf$ in the opposite direction. Therefore,the graph shows a constant $emf$ for $0 < t < 5$,zero $emf$ for $5 < t < 20$,and a constant $emf$ of opposite sign for $20 < t < 25$. This matches graph $D$.

$A$ square loop of side $5 \ cm$ enters a magnetic field with a velocity of $1 \ cm/s$. The front edge enters the magnetic field at $t = 0$. Which graph best depicts the induced $emf$?

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