Two circular coils $P$ and $Q$ are fixed coaxially and carry currents $I_1$ and $I_2$ respectively.

  • A
    If $I_2 = 0$ and $P$ moves towards $Q$,a current in the same direction as $I_1$ is induced in $Q$.
  • B
    If $I_1 = 0$ and $Q$ moves towards $P$,a current in the opposite direction to that of $I_2$ is induced in $P$.
  • C
    When $I_1 \neq 0$ and $I_2 \neq 0$ are in opposite directions,then the coils tend to move apart.
  • D
    Both $(B)$ and $(C)$.

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$(a)$ $A$ closed loop is held stationary in the magnetic field between the north and south poles of two permanent magnets held fixed. Can we hope to generate current in the loop by using very strong magnets?
$(b)$ $A$ closed loop moves normal to the constant electric field between the plates of a large capacitor. Is a current induced in the loop
$\quad (i)$ when it is wholly inside the region between the capacitor plates
$\quad (ii)$ when it is partially outside the plates of the capacitor? The electric field is normal to the plane of the loop.
$(c)$ $A$ rectangular loop and a circular loop are moving out of a uniform magnetic field region to a field-free region with a constant velocity $v$. In which loop do you expect the induced emf to be constant during the passage out of the field region? The field is normal to the loops.
$(d)$ Predict the polarity of the capacitor in the situation described by the figure.

The switch $S$ of the circuit shown in the figure is closed at $t = 0$. If $e$ denotes the induced emf in the inductor $L$ and $i$ denotes the current flowing through the circuit at time $t$,which of the following graphs correctly represents the variation of $e$ with time $t$?

$A$ magnet $NS$ is suspended from a spring and while it oscillates,the magnet moves in and out of the coil $C$. The coil is connected to a galvanometer $G$. Then as the magnet oscillates,

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

Match the List-$I$ with List-$II$:
List-$I$List-$II$
$A$. Magnetic induction$I$. $MLT^{-2}A^{-2}$
$B$. Magnetic flux$II$. $ML^2T^{-2}A^{-2}$
$C$. Magnetic permeability$III$. $ML^0T^{-2}A^{-1}$
$D$. Self inductance$IV$. $ML^2T^{-2}A^{-1}$

Choose the correct answer from the options given below:

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