MHT CET 2023 11th May Evening Shift | Electromagnetic Induction Question 54 | Physics

The magnetic flux through a circuit of resistance '$$R$$' changes by an amount $$\Delta \phi$$ in the time $$\Delta t$$. The total quantity of electric charge '$$Q$$' which passes during this time through any point of the circuit is

$$-\frac{\Delta \phi}{\Delta t}+R$$

$$\frac{\Delta \phi}{\mathrm{R}}$$

$$\frac{\Delta \phi}{\Delta t}$$

$$\frac{\Delta \phi}{\Delta t} \times R$$

MHT CET 2023 11th May Evening Shift

MCQ (Single Correct Answer)

-0

The self inductance '$$L$$' of a solenoid of length '$$l$$' and area of cross-section '$$\mathrm{A}$$', with a fixed number of turns '$$\mathrm{N}$$' increases as

both $$l$$ and $$A$$ increase

$$l$$ decreases and $$\mathrm{A}$$ increases

$$l$$ increases and A decreases

both $$l$$ and A decrease

MHT CET 2023 11th May Evening Shift

MCQ (Single Correct Answer)

-0

A coil having effective area '$$A$$' is held with its plane normal to a magnitude field of induction '$$\mathrm{B}$$'. The magnetic induction is quickly reduced to $$25 \%$$ of its initial value in 1 second. The e.m.f. induced in the coil (in volt) will be

$$\frac{\mathrm{BA}}{4}$$

$$\frac{\mathrm{BA}}{2}$$

$$\frac{3 \mathrm{BA}}{8}$$

$$\frac{3 \mathrm{BA}}{4}$$

MHT CET 2023 11th May Morning Shift

MCQ (Single Correct Answer)

-0

A coil of radius '$$r$$' is placed on another coil (whose radius is $$\mathrm{R}$$ and current flowing through it is changing) so that their centres coincide $$(\mathrm{R} \gg \mathrm{r})$$. If both the coils are coplanar then the mutual inductance between them is ( $$\mu_0=$$ permeability of free space)

$$\frac{\mu_0 \pi \mathrm{R}^2}{2 \mathrm{r}}$$

$$\frac{\mu_0 \pi r^2}{2 R}$$

$$\frac{\mu_0 \pi r^2}{R}$$

$$\mu_0 \pi R^2$$

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