1.

As shown in the figure a metal rod makes contact and complete the circuit. The circuite is perpendicular to the magnetic field with `B=0.15`tesla. If the resistance is `3Omega` force needed to move the rod as indicated with a constant speed of `2m//sec` is A. `3.75xx10^(-3N)`B. `3.75xx10^(-2N)`C. `3.75xx10^(2N)`D. `3.75xx10^(-4N)`

Answer» Correct Answer - 1
`F=iBl=(VBl)/(R )Bl`
`F=(VB^(2)l^(2))/(R )`


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