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The Magnetic Field in a Region is Given by → B = → K B 0 L Y Where L is a Fixed Length. a Conducting Rod of Length L Lies Along the Y-axis Between the Origin and the Point (0, L, 0). - Physics


The magnetic field in a region is given by \[\overrightarrow{B}  =  \overrightarrow{k} \frac{B_0}{L}y\] where L is a fixed length. A conducting rod of length L lies along the Y-axis between the origin and the point (0, L, 0). If the rod moves with a velocity v = v\[\overrightarrow{i},\] find the emf induced between the ends of the rod.

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Magnetic field in the given region,

\[\overrightarrow{B}  = \frac{B_0}{L}y \hat k\]

Length of the rod on the y-axis = L

Velocity of the rod, v = v\[\hat i\]

We will consider a small element of length dy on the rod.


Emf induced in the element:-

de = Bvdy

\[\Rightarrow de = \frac{B_0}{L}y \times  v_0  \times dy\]

\[                     = \frac{B_0 v_0}{L}ydy\]


\[e = \frac{B_0 v_0}{L} \int\limits_0^L ydy\]

\[     = \frac{B_0 v_0}{L} \left[ \frac{y^2}{2} \right]_0^L \]

\[     = \frac{B_0 v_0}{L}\frac{L^2}{2}\]

\[     = \frac{1}{2} B_0  v_0 L\]

Concept: Induced Emf and Current
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 16 Electromagnetic Induction
Q 54 | Page 310
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