Two coils P and Q are placed co-axially and c | vedclass

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(B) According to Lenz's law,the induced current in a coil always opposes the change in magnetic flux that produces it.$(a)$ If $I' = 0$ and $P$ moves

Vedclass · Accepted Answer

If $I = 0$ and $Q$ moves towards $P$,a current opposite in direction to that of $I'$ is induced in $P$.

Vedclass · Answer

(B) According to Lenz's law,the induced current in a coil always opposes the change in magnetic flux that produces it.$(a)$ If $I' = 0$ and $P$ moves towards $Q$,the magnetic flux through $Q$ increases. To oppose this increase,$Q$ will induce a current such that it creates a magnetic field opposing the field of $P$. By the right-hand rule,this induced current will be in the opposite direction to $I$.$(b)$ If $I = 0$ and $Q$ moves towards $P$,the magnetic flux through $P$ increases. To oppose this increase,$P$ will induce a current such that it creates a magnetic field opposing the field of $Q$. By the right-hand rule,this induced current will be in the opposite direction to $I'$. Thus,option $(b)$ is correct.$(c)$ When two coils carry currents in the same direction,they act like two parallel wires carrying currents in the same direction,which attract each other. Therefore,they tend to move closer,not apart.

Two coils $P$ and $Q$ are placed co-axially and carry currents $I$ and $I'$ respectively.

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