The magnetic flux near the axis and inside the air core solenoid of length 60 cm carrying current I is $\dfrac{\pi}{2} \times 10^{-6}$ Wb. Its magnetic moment will be (cross-sectional area is very small as compared to length of solenoid, $\mu_0$ = Permeability of free space = $4\pi \times 10^{-7}$ SI unit)

If the number of turns in the coil of a moving coil galvanometer decreases, the resistance of the galvanometer,

The current flowing through the inductor of self inductance 'L' is continuously increasing at constant rate. The variation of induced e.m.f. (e) versus $\dfrac{dI}{dt}$ is shown graphically by figure

Two coils P and Q have mutual inductance 'M' H. If the current in the coil P is $I = I_0 \sin \omega t$, then the maximum value of e.m.f. induced in coil Q is