Physics, asked by caronduke009, 1 year ago

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the maximum deflection of the galvanometer was observed when the magnet was moving out of the solenoid why explain me ???

Answers

Answered by priyan22804
0
 

A wire coil is connected to a galvanometer. When you push a magnet towards the center of the coil, then pull it away, the galvanometer needle deflects in one direction, then the other. How far the needle deflects depends on the strength of the magnet and how fast you move it.

This demonstration is an illustration of Faraday’s law of induction, which states that a changing magnetic flux induces an electromotive force, or emf, in a loop of wire, or E = -dΦB/dt. This emf then pushes a current through the loop. Even though it is the induced emf that is responsible for the current, it is not uncommon for people to speak of the current as being induced by the changing magnetic flux, as a kind of shorthand. For a coil wound so that the turns are close to each other, the change in flux through each turn is the same, and an emf appears across each turn. Thus, for a coil of N turns, the emf across the whole coil is E = -NdΦB/dt.

This also demonstrates Lenz’s law, which states that the current produced by the induced emf flows in the direction that opposes the change in flux that induced the emf. This is implied by the minus sign in Faraday’s law. If you bring the north end of the magnet towards the coil, the induced emf produces a current whose associated magnetic field has its north end pointing towards the magnet. (See demonstrations 68.13 -- Right-hand rule model, and 68.46 -- Magnetic fields of coils.) If you pull the north end away from the magnet, the current flows in the opposite direction, so that the associated magnetic field points with its south pole towards the magnet. Similarly, if you flip the magnet to bring its south pole towards the coil, the current flows in the direction that produces a magnetic field whose south pole faces the magnet, and if you pull the magnet away, it reverses so that the north pole faces the magnet. How fast you move the magnet determines the rate of change of the magnetic flux, so the faster you move the magnet, the greater the needle deflection.

Which way the galvanometer deflects depends on which side of the coil faces the magnet as you are moving it. The coils are marked to show which end goes to the red wire and which end goes to the black wire, so that if you wish, you can predict the direction in which the needle will deflect as you move the magnet.

It does not matter, of course, whether you keep the coil stationary and move the magnet, or keep the magnet stationary and move the coil. What is important is their motion relative to each other, which is what determines the change in magnetic flux through the coil.



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caronduke009: u didnt answer properly
caronduke009: see the question priyan
tomboy1992: u didnt answer correctly
caronduke009: tom pls answer it pls
caronduke009: hey u priyan just shut up
tomboy1992: because outside the solinoid the magnetic field is minimum. thats why it shows maximum deflection
Answered by tomboy1992
1
because outside the solenoid magnetic field is minimum . so the galvanometer shows maximum deflaction as it shows the effectiveness of magnetic field
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