Please answer question 3 on the prelab please: According to Newton\'s 3rd law ev
ID: 1646741 • Letter: P
Question
Please answer question 3 on the prelab please:
According to Newton's 3rd law every action has equal and opposite reaction ..so when a current carrying wire is placed in magnetic field than a force is experience wire due to magnetic field produced and similarly magnet will experience same force on magnet due to current carrying wire.
2. In the force measurements of this experiment, you will assume that only the horizontal current branch is contributing to the downward force on the magnet. Explain why the magnetic forces on the vertical current branches should not contribute to the net downward force on the magnet
As F=ILBsin© , the effect of force on current carrying wire depend on the orientation of the wire in magnetic field ..If the wire is horizontally placed than ©=90 and force ,F=ILB as sin90=1 but if the wire is placed in vertically with the magnetic field than ©=0 or ©=180 and force F=0 as sin0=0 and sin180=0 .So vertical component will contribute no force only horizontal component give F=0.
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3. As the lab handout shows, you should expect to get a straight line for your Force vs. Current graph in Experiment 1. The slope of that line is equal to the force per current (F/I). What combination of physical quantities (other than the obvious F/I) does the slope of that line represent? Why should you expect that combination to be constant in Experiment 1? (Assume you use an actual force, not a “force” in grams.)
(Note: if you were to graph F/I in the other experiments listed in the handout, you would not get a straight line. You do not need to address this in your answer, but it’s good to be aware of this fact.)
Check this link it might help in your answer:
file:///C:/Users/salam1/Downloads/current_balance_sc2.pdf
Explanation / Answer
1. since the magnetic force on the wire is an action reaction force, so according to newtons third law, there should be an equal but opposite force on the permanent magnets whioch can be measured for the experiment
2. the magnetic fores on the vertical branches are in antiparallel direction as the currents in the two branches is antiparallel
this antiparallel nature of forces cancels each others effects and hence the effect of horizontal wire is the only force
3. so, we know that F = Bil
so, F/i = Bl
Bl is the slope of the graph
so the slope represents the magnetic field times the length of the conductor too
also, i = q/t
F = dp/t
F/i = dp/q
so it also represents change in momentum of the wire per unit charge that passes through it