(B) When a conductor of length $l$ moves with velocity $v$ in a magnetic field $B$ perpendicular to its length and the velocity vector,the induced mot

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(B) When a conductor of length $l$ moves with velocity $v$ in a magnetic field $B$ perpendicular to its length and the velocity vector,the induced motional emf is given by $E = Blv$.In this system,there are two moving conducting segments (the curved ends of the $U$ tubes),each of length $l$,moving towards each other with speed $v$.Each moving segment acts as a source of motional emf with magnitude $E = Blv$.Since both tubes are moving towards each other,the induced emfs in the two segments are in series and additive in the closed loop.Therefore,the net induced emf in the circuit is $E_{\text{net}} = Blv + Blv = 2Blv$.

Class 12 Physics Electromagnetic Induction Motional EMI (Induced Parameter)

Medium

One conducting $U$ tube can slide inside another as shown in the figure,maintaining electrical contacts between the tubes. The magnetic field $B$ is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed $v$,then the emf induced in the circuit in terms of $B, l$ and $v$,where $l$ is the width of each tube,will be

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Zero
B
$2Blv$
C
$Blv$
D
$-Blv$

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Electromagnetic Induction

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Motional EMI (Induced Parameter)

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MediumAP EAMCET 2017

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$A$ metal disc of radius $a = 10 \ cm$ rotates with a constant angular speed of $\omega = 200 \ rad \ s^{-1}$ about its axis. The potential difference between the centre and the rim of the disc under a uniform magnetic field $B = 5 \ mT$ directed perpendicular to the disc is: (in $mV$)

MediumTS EAMCET 2019

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$A$ conducting rod moves towards the right with a constant velocity $v$ in a uniform transverse magnetic field. Determine the nature of the graphs between the force applied by the external agent versus velocity and the power supplied by the external agent versus velocity.

$A$ conducting rod $AB$ moves parallel to the $X-$ axis in a uniform magnetic field,which is directed perpendicular to the plane of motion (outwards). The end $A$ of the rod gets:

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$A$ metal disc of radius $a = 10 \ cm$ rotates with a constant angular speed of $\omega = 200 \ rad \ s^{-1}$ about its axis. The potential difference between the centre and the rim of the disc under a uniform magnetic field $B = 5 \ mT$ directed perpendicular to the disc is: (in $mV$)

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