U-shaped electromagnet Connect the two coils in series and the oirary celil e U-

Question

U-shaped electromagnet Connect the two coils in series and the oirary celil e U-sh the Uishaped core n north pole and the other ewthe switet the and indieate its polarity and the direction of current now in each in each coil. Placing the iroe armature f che magnet, determine try the use of weights the lining power o determine the liffing force twice more. the electromagnet. Use two more 7. Determination of the earth's magnetic field: A. Determination of the horieontal component of the eartas magnetic field wing a tangent the tangent galvanometer (the large coil ounted in a vertical plane, with a plane of the coil is along the magnetic meridian, as determined by the conmpass and coil. Close the swtch the compans needlke series combination of the switch, variable resistor, ammeter, variable resistor until the compass deflects exactly 45 east (or west) and adjust Record the ammeter current. Reverse the current (and the amncter) and adjust the resistor until meridian. Reoord the currents and calculate, using the thoorctical foonmula for the magnetic fiekd at the horizontal component of the carth's magnetic center of a circular coil, the component of the earth's magnetic fickd and the total magnetic field of the earth the carth's B. Determination of the vertical Set the dipping needle's plane along the magnetic meridian and measure and record the dip in the earth's mag field. Making use of this dip angle and the results of part A above, calculate the magnetic field and the total magnetic field of the earth. vertical compoeent of I. Why can magnetic lines of force not interseet? 2. What is meant by saying that a magnetic field line is a "closed loop"? 3. What is meant by the term "flux density"7 one "shield" a piece of equipment from a strong magnetic field? 4. How could 5 What is meant by (a) declination of the earth's magnetic field, and (b) inclination of the earth's magnetic field? 6. Discuss how the tangent galvanometer may be used as a current measuring device. 7. Assume the tangent galvanometer to be set up as you used it in the laboratory. Knowing the horizontal component of the earth's magnetic field (your results), calculate the current required to deflect the compass needle (a) 30 degrees, (b) 60 degrees, and (c) 90 degrees. 8. Given two bars of iron. One is a magnet, the other is not. With no markings on the bars of iron and no additional equipment or supplies, describe a method to determine which of the bars is magnetized. PHYSIC 54

Explanation / Answer

1) Why magnetic lines of force not intersect?

magnetic field lines never intersect each other because if they do it means at the point of intersection the compass needle is showing two different directions which is not possible with the magnetic compass.

2) since the non existence of magnetic monopole and presence of magnetic dipoles ( North and south pole). They form a closed loop it starts from magnetic north pole and ends at magnetic south pole hence they form a loop.

3) Magnetic flux density :- It is the number of magnetic field lines passing through the unit area . unit :- Tesla

4)To block out magnetic "force," is to change the direction of magnetic field lines around the object that is sensitive to those lines. shielding the object in a material with a much higher magnetic permeability of the surrounding materials.One can use mu-metal to shield. In oscilloscopes, that are like TV screens, where a line of electrons "paint" the image onto the screen. Since magnetic fields affect the line of electrons, there needs to be no external field around the scope tube. A mu-metal can shield it from external magnetic field .

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