question_answer

Consider the given case Magnetic field of 1 Tesla is applied to this arrangement. If connecting wires and rods have negligible resistance. Then, current through \[5\Omega \] resistor is

A)  120 mA                               

B)  40 mA

C)  80 mA                                 

D)  60 mA

Correct Answer: B

Solution :

 Potential difference induced in both the rods would have different polarity. PD (potential difference) in \[ab=B/v=1\times 0.1m\times 4m/s=0.4V\] PD (potential difference) in \[cd=B/v=1\times 0.1m\times 2m/s=0.2V\] So, the arrangement would act like \[\therefore \]Current\[l=\frac{0.4-0.2}{5}=\frac{0.2}{5}=0.04A=40mA\]