Please help with 7 Thank you In this experiment, you will use an ordinary electr

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Please help with 7

Thank you

In this experiment, you will use an ordinary electronic balance to measure the force between current-carrying wires and between wires and permanent magnets. The coil of wire that is placed on the balance will be referred to as the balance coil, and the other coil will be referred to as the top coil. A diagram of the apparatus for measuring the forces between the coils is shown in Figure 4.2. 1. The balance coil leads are connected to the power supply and the current is set to the value 11. The meter on Top Coll the power supply is sufficiently precise for this setting. Please note that the leads of the balance coil must not move during the experiment. You will understand why as you do the experiment. Balance Coil 2. The top coil is the one that is attached to the stand and the one in which the current will be varied. The top coil has been adjusted to be from 1.00 mm to 3.00 mm Balance Pan above the balance coil, so please do not change its Figure 4.2: Magnetic forces – height. experimental setup The top coil is connected to a programmable power supply, and the voltage will be programmed to change in a | PS specified way, causing the current in the coil to vary in a specified way. The resistance in most of the top coils is a few ohms, so you do not need to measure it. In the next section, you will adjust the voltage in the top coil to vary coil from 0.00 volts to Vmax volts in increments of AV volts with each setting lasting 15 seconds. The circuit for the Figure 4.3: Top coil setup top coil is shown to the left. Your instructor will give you the values for Vmax and AV. coil 7. Carefully slide the balance (with the balance coil) away from the top coil. Hold the bar magnet close to the balance coil in each of the configurations shown in Figure 4.4. What are the possible directions of the force for each of the magnet orientations? Magnet Magnet Magnet Balance Coil saiene col C Balance Coil Balance Coil | Balance Pan Balance Pan Balance Pan Balance Reading - Balance Reading- Figure 4.4: Magnetic forces - coil and magnet Balance Reading -

Explanation / Answer

There are two coils in the given experiment, The top coil and the balance coil.
Given the distance between the two coils is about 1.00mm to 3.00mm.
The power supply is connected to the balance coil, and the current I1 is passed through the balance coil.
We know when the current is passed through any coil, the emf is induced in the coil which is called self induced EMF which is proportional to the current.
Hence at this position there is a self induced EMF around the balanced coil.
As the top coil is at a distance of 1.00mm-3.00mm from balance coil, emf is induced in the top coil due to mutual conncection between the coil. This EMF is called mutually induced EMF.
The Programmable power supply is conncected to the trip coil as shown in figure, By using this scheme the voltage can be varied by a program.
From the figure 4.4
Case 1:
In this position there is a self induced emf in the balance coil and when the Bar magnet is placed near to the balance coil it experiences a force depends on the north and south pole of the bar magnet.
In the bar magnet we know the magnetic lines of force will flow from north pole to south pole , hence the north pole attracts to the coil and south pole repels to the coil.
In this case the north pole of the magnet attracts to the coil.
Case 2:
In this case the north pole and the south pole of the bar magnet is equidistant from the balance coil. Hence only the north pole attracts to the balance coil and the magnet position is changed from horizontal to vertical.
Case 3:
In this case the south pole is nearer to balance coil, hence it gets repelled by the balance coil.

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