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JEE Main 2025 (Online) 28th January Evening Shift
Numerical
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JEE Main 2025 (Online) 28th January Evening Shift Physics - Electromagnetic Induction Question 4 English

A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field B exists into the page. The bar starts to move from the vertex at time t = 0 with a constant velocity. If the induced EMF is E ∝ tn, then value of n is _________.

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2
JEE Main 2025 (Online) 23rd January Morning Shift
Numerical
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JEE Main 2025 (Online) 23rd January Morning Shift Physics - Electromagnetic Induction Question 1 English

In the given circuit the sliding contact is pulled outwards such that electric current in the circuit changes at the rate of $8 \mathrm{~A} / \mathrm{s}$. At an instant when R is $12 \Omega$, the value of the current in the circuit will be ________ A.

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3
JEE Main 2024 (Online) 5th April Evening Shift
Numerical
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-1
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The current in an inductor is given by $$\mathrm{I}=(3 \mathrm{t}+8)$$ where $$\mathrm{t}$$ is in second. The magnitude of induced emf produced in the inductor is $$12 \mathrm{~mV}$$. The self-inductance of the inductor _________ $$\mathrm{mH}$$.

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4
JEE Main 2024 (Online) 1st February Evening Shift
Numerical
+4
-1
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A coil of 200 turns and area $0.20 \mathrm{~m}^2$ is rotated at half a revolution per second and is placed in uniform magnetic field of $0.01 \mathrm{~T}$ perpendicular to axis of rotation of the coil. The maximum voltage generated in the coil is $\frac{2 \pi}{\beta}$ volt. The value of $\beta$ is _______.
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