Two conducting rails are connected to a source of emf and form an incline as shown in figure. A bar of mass 50g slides without friction down the incline through a vertical magnetic field B. If the length of the bar is 50 cm and a current of 2.5 A is provided by battery. Value of B for which the bar slide at a constant velocity ……..×10 –1 Tesla. [g = 10 m/s 2 ]
Text Solution
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(3)
Sol.
F cos θ = Mg sin θ
BI L cos θ = Mg sin θ
B = 
= 0.3 Tesla
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