17% O Thu 10:19 PM a E Chrome File Edit View History Bookmarks People Window Hel

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17% O Thu 10:19 PM a E Chrome File Edit View History Bookmarks People Window Help Mastering Physics: Chapter 27 Homework https:// session.masteringphysics.com/ myct/itemView? assignmentProblemID-59016814 MIPABRAHAM 25242016S Signed in as Tanner Calloway Help Close Chapter 27 Homework Exercise 27.39 previous l 9 of 13 l next The circuit shown in the figure is used to make a magnetic balance to weigh objects. The mass m to be Part A measured is hung from the center of the bar, that is uniform magnetic field of 50 T, directed into the plane Which point, a or b, should be the positive terminal of the battery? 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 light-weight material. It is connected to the battery by thin vertical wires that can support no appreciable tension; all the weight of the suspended mass m is supported by the magnetic force Subm My Answers Give U on the bar. A resistor with R 5.00 S is in series with the bar the resistance of the rest of the circu s much less than this. (Figure 1) Part B Fig If the maximum terminal voltage of the battery is 175 V, what is the greatest mass mn that this instrument can measure? 5.00 Battery kg Subm My Answers Give U X X X Bar X X X |X Continue Provide Feedback

Explanation / Answer

Point A should be at hugher potential

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b) Maximum Current through the wire

Im = Vm/R

Im = 175/5

Im = 35 A
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L=60 cm

Maximum Magnetic force Fmax=BImaxL

Fb = 1.5*35*0.6

Fmax = mg = 31.5 N

mass =F/g

m =31.5/9.8

m=3.21 kg (ANSWER)

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