MHT CET 2025 19th April Evening Shift | Electromagnetic Induction Question 19 | Physics

The magnetic flux through a coil is $4 \times 10^{-4} \mathrm{~Wb}$ at time $t=0$. It reduces to $30 \%$ of its original value in time $t$ second. If e.m.f. induced in the coil is 0.56 mV then the value of $t$ is

0.5 s

$\quad 0.4 \mathrm{~s}$

0.8 s

0.7 s

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

When three inductors of same inductance ' $L$ ' are connected in series and ' I ' is the current passing through the circuit. The energy stored in the circuit is

$\frac{1}{2} \mathrm{LI}^2$

$\frac{3}{2} \mathrm{LI}^2$

$\frac{5}{2} \mathrm{LI}^2$

$\frac{7}{2} \mathrm{LI}^2$

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

The self-inductance of a circuit is numerically equal to

the work done in establishing the magnetic flux associated with circuit.

twice the work done in establishing the magnetic flux associated with unit current in the circuit.

thrice the work done in establishing the magnetic flux associated with unit current in the circuit.

the work done in establishing the magnetic flux associated with unit current in the circuit.

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

Two conducting circular loops of radii $R_1$ and $\mathrm{R}_2$ are placed in the same plane with their centres coinciding. If $R_1>R_2$, the mutual inductance M between them will be directly proportional to

$\frac{\mathrm{R}_1}{\mathrm{R}_2}$

$\frac{R_2}{R_1}$

$\frac{\mathrm{R}_1^2}{\mathrm{R}_2}$

$\frac{R_2^2}{R_1}$

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