Question

2. Gm Lab report on Experiment 71 1. Your lab report should be in the require Graph Page #1 (similar to Fig. 2) should be included in your lab report. 3. Table I should be included in your lab report. 4. It is required that the answers or solutions to th P. should be in the required format described in the "Introduction" of the lab manual. report. the answers or solutions to the questions (see below) should be included in your lab (raw) data and analyzed data, answers to questions. The data fear those pages out of the lab manual as a part of your lab report, which contain measured analyzed data, answers to questions. The data sheets must be checked and signed by your lab TA Questions 1. The four VO The four (1) curves from four measurements show that the incoming and outgoing peaks are opposite in direction. Why? 2. Explain why the magnitude of the incoming peak is less than the outgoing peak as shown in the four V(t) curves and in the Table on the graph page. 3. Explain why the magnitudes of both the incoming and outgoing peaks in 2mNd curve are greater than that in 1mNd curve (see the values in the Table). 4. Use Lenz's law to determine whether the induced current in the resistor R is from A to B or from B to A in the 4 configurations in Fig. 3. You should label the direction of the sign of AD/A/, the direction of B and the direction of in the coil and R for each of the 4 cases. N (0 s (3) (4) R Figure 3 Four configurations

Answer 1

1. Graph for case 14 case 2 for ot, taku incoming & J. Ein Bin (1) 1 t, -t 6 hoh- ve 1 outgoing Bin byt ↑ Iin (一十 Viu outgoing, 七.. {一}

Faraday's Law where PB = NSB i da I OR PE=NB.A B+ magnetic field At Area of open surface thorough which magnetic field is passing. Na No. of twins a Vin = -NA dB 80 induced voltage depends upon the rate of change of magnetic field pasting thorough an open surface attached to a close loop (conducting) in fiest condition as 's' pole of magnet is approaching to the coil 10 the magnetic field lines, which is entering to 's' pole of magnet, will increase so the property of induced current. C it will appose that of by which it is produced it will ob pose

the phenomenon of increasing magnetic field in up direction so it will start to generate another magnetic field which is in downward disin so the net effect will be minimized by the induced current. To produce downward magnetic field curront should flow from A to B in outer circuit. The graph shows initially zero value of Wit) because initially magnet will be in rest and as it will approach the coil the value of induced voltage will increase but as we go enough close to the coil we stop the magnet again do the value of induced current goes to zero again. similarly for graph (2) as magnet goes fas magnetic field passing lines start to reduce the through open to the coil. surface area induced current will try to increase them so it will produce Bin in upward direction team e supportive)

simileoly graph (3) os N pole approaches to the coil, the coil will oppose the increment in magnetic field lines ( downward) so they induce the magnetic field lines in upward direction hence current will induce from B to A point in outer circuito Some for Graph (4) as this is the case same as first one ( graph 1) just coil winding direction is changed. so the induced current linection also changed. for Answer part ② & ③ it is discussed in question about a table which is not shown in question. The peaks of vt) curre depends upon the process speed i.e. how fast it is happening Vin da vin qa do eslow process) e fast process)

0 for the answer read out the first and see the diagrams which initially part answer I have drawn © -magnet open surface for understanding these phenomenon we have to assume an open surface at point 'p' of t If the cylinder is conducting T i material then the ring which is attached to the open surface will induced an electric current such that it will oppose the motion of magnet because as the magnet approaches the ring magnetic flux changes so there will be a very large number of auch rings in cylinder which will oppose the motion of magnet and it will come to the other end after a quite darger time in comperison of ain because in air there is no such induced currento

Because initially there is no current in coil so there is no magnetic field. In other wards the coil is not behaving like a magnet. But as there is current in coil so there will be a magnetic field at a tine 't' A4449 as shown in figure o will be in upward dier. as current goes from Ó' to '2 foit peak value] 80 as current is changing from 0 → 1o, magneti'e field also changes which will change the flux passing Aweough the aluminium ring so there will also be an induced current But it will oppose the increment of current so the induced current will induced a magnetic field just opposite the B hence there will be a repulsive force between ring and electromagnet. If the magnitude of repulsive force is high enough to overcome the weight of ring then it will fly upward.