1. Tardigrade
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  4. A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 7 T. A 10 V light bulb is in a series with the loop as shown in the figure. The magnetic field is decreasing steadily to zero over a time interval Δ t. For what value of Δ t (in .× 103 sec ), the bulb will shine with full brightness?

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Q. A square wire loop of $10.0\, cm$ side lies at right angles to a uniform magnetic field of $7 \,T. A \,10\, V$ light bulb is in a series with the loop as shown in the figure. The magnetic field is decreasing steadily to zero over a time interval $\Delta t$. For what value of $\Delta t$ (in $\left.\times 10^{3} \sec \right)$, the bulb will shine with full brightness?Physics Question Image

Electromagnetic Induction

Solution:

Induced emf should be equal to $10\, V$
$e=A \frac{d B}{d t}$
$\Rightarrow 10=\left(\frac{10}{100}\right)^{2} \frac{7}{\Delta t}$
$\Rightarrow \Delta t=7\, ms$