A thin, 50 cm long metal bar with mass 750 g rests on, but is not attrached to, two metallic supports in a uniform 0.450T magnetic field, as shown in fig. A battery and a `25Omega` resistor in series are connected to the supports. What is the largest voltage the battery can have without breaking the circuit at the supports?A. `817V`B. `412V`C. `325V`D. `160V`

A thin, 50 cm long metal bar with mass 750 g rests on, but is not attr

1.	A thin, 50 cm long metal bar with mass 750 g rests on, but is not attrached to, two metallic supports in a uniform 0.450T magnetic field, as shown in fig. A battery and a `25Omega` resistor in series are connected to the supports. What is the largest voltage the battery can have without breaking the circuit at the supports?A. `817V`B. `412V`C. `325V`D. `160V`
Answer» Correct Answer - a (a) `F_1=mg` When bar is just ready to levitate, `IlB=mg, I=(mg)/(lB)=((0.75kg)(9.80m//s^2))/((0.500m)(0.450T))=32.67T` `epsilon=IR=(32.67A)(25.0Omega)=817V` (b) `R=2.0Omega, I=epsilon/R=(817V)(2.0Omega)=408.5A` `F_1=IlB=92N` `a=(F_1-mg)//a=113ms^-2`

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