9. (a) Classify materials based on their magnetic properties citing an example i

Question

9.

(a) Classify materials based on their magnetic properties citing an example in each catagory

(b) 15 Amp current flows through a wire NCBAM as shown in the diagram. NC and AM are straight sections of the wire and ABC is a semicircular section with radius of 20cm.The flow of current is shown in the figure . Point P is at the center of the semicircular section and on the same line as wire segment MA

(i)What is the direction of the magnetic field at point P.    (5)

(ii) What is the magnitude of the magnetic field at point P. (15)

Explanation / Answer

Part A

Diamagnetic - copper, silver, and gold

Paramagnetic - magnesium, molybdenum, lithium

Ferromagnetic - Iron , cobalt , nickel

Part B

Direction of magnetic field due to both wire section will be inwardsto the page

Part C

magnetic field due to sectin NC

B1 = uo* I/4*pi*d

magnetic field due to semicircular section

B2 = uo*I/4d

total magnetic field will be inward to the page so

B = B1+B2

B = uo*I/4d(1/pi + 1)

B = 4pi*10^-7 * 15/4*0.20(1/3.14+1)

B = 1.73 x 10^-5 tesla

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