COMEDK 2025 Afternoon Shift | Electromagnetic Induction Question 1 | Physics

A circular coil of area $2 \sqrt{2} \mathrm{~cm}^2$ and resistance $2 \boldsymbol{\Omega}$ is arranged vertically in the east -west direction. A uniform magnetic field 0.2 T is set up across the plane in the north to east direction. Now the magnetic field is removed at a steady rate in 0.4 s What is the current developed in the coil?

$0.5 \times 10^{-3} A$

$0.5 \times 10^{-4} A$

$1 \times 10^{-4} A$

$0.5 \times 10^{-5} A$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

A current of 2 A is passed through the primary coil. The total flux linked with the secondary coil, which is closely wound over the primary is $2000 \times 10^{-6}$ weber. What is the induced emf in the secondary if the current through the primary increases at a rate of $0.2 \mathrm{As}^{-1}$ ?

$2 \times 10^{-4} V$

$4 \times 10^{-4} V$

$1 \times 10^{-4} V$

$8 \times 10^{-4} V$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

The magnetic flux $\phi$ through a stationary loop of wire having a resistance R varies with time as $\phi=4 t^2+3 t$. The average emf and total charge flowing in the loop in the time interval $t=0$ to $t=\tau$ respectively are

$\tau+3, \quad \frac{4 \tau^2+3 \tau}{R}$

$3 \tau+4, \quad \frac{4 \tau^2+3 \tau}{R}$

$4 \tau+3, \quad \frac{4 r+3}{R}$

$4 \tau+3, \quad \frac{4 \tau^2+3 \tau}{R}$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

A conducting circular loop is placed in a uniform magnetic field $$\mathrm{B}=0.125 \mathrm{~T}$$ with its plane perpendicular to the loop. If the radius of the loop is made to shrink at a constant rate of $$2 \mathrm{~mm} \mathrm{~s}^{-1}$$, then the induced emf when the radius is $$4 \mathrm{~cm}$$ is

$$0.52 \pi \mu V$$

$$20 \pi \mu V$$

$$\frac{2}{3}\mu V$$

$$\frac{3 \pi}{2} \mu V$$

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