Physics · 2016
NEET 2016 · 24 July · Code AA · Q31
A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate (d B)/(d t). Loop 1 of radius R>r…
A uniform magnetic field is restricted within a region of radius $\displaystyle r$. The magnetic field changes with time at a rate $\displaystyle \frac{d \vec{B}}{d t}$. Loop $\displaystyle 1$ of radius $\displaystyle R>r$ encloses the region $\displaystyle r$ and loop $\displaystyle 2$ of radius $\displaystyle R$ is outside the region of magnetic field as shown in the figure below. Then the e.m.f. generated is
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle -\frac{d \vec{B}}{d t} \pi r^2$ in loop $\displaystyle 1$ and zero in loop $\displaystyle 2$
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NEET (UG) 2016 Physics question, with the answer from NTA’s final answer key. Where our answers come from.