Figure 9 shows a metallic rod MN of length moving in an external uniform magnetic field, which is…
Physics20255 marksNumerical
(a)[2.5]
Figure 9 shows a metallic rod MN of length $l = 3\text{ m}$ moving in an external uniform magnetic field, $B = \left(\frac{2}{3}\right)\text{ T}$ which is directed into the plane of this paper.
If the position of the rod changes with time as $x = \pi t$, where $x$ is in meter and $t$ is in second, then:
(1) Calculate the motional emf developed in the rod.
(2) Name the law used to find the direction of induced current.
(b)[2.5]
When current flowing through a solenoid decreases from $15\text{ A}$ to $0$ in $0.2\text{ s}$, an emf of $30\text{ V}$ is induced in it. Calculate the coefficient of self-inductance of the solenoid.
