Please give as much detail as possible. Magnetic balance. The circuit shown in t

Question

Please give as much detail as possible. Magnetic balance. The circuit shown in the figure is used to make a magnetic balance to weight objects. The mass m to be measured is hung from the center of the bar, which is in a uniform magnetic field of 1.50 T directed into the plane of the figure. The battery voltage can be adjusted to vary the current in the circuit. The horizontal bar is 60.0 cm long and is made of extremely lightweight material, so its mass can be ignored. It is connected to the battery by thin vertical wires that can support no appreciable tension; all the weight of the mass m is supported by the magnetic force on the bar. A 5.00 resistor is in series with the bar, and the resistance of the rest of the circuit is negligibly small. a) b) Which point, a or b should be the positive terminal of the battery? If the maximum terminal voltage of the battery is 175 V, what is the greatest mass m that this instrument can measure? b 5.00 Battery × × Bar × ×

Explanation / Answer

a)

From right hand rule ,the current flows from b to a ,therfore point "a" positive terminal of battey

b)

Current

I=V/R=175/5=35 A

magnetic force

FB=BIL=1.5*35*0.6=31.5 N

mass

m=F/g =31.5/9.8=3.214 kg

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