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3. (30 pts) A certain solenoid consists of 100 turns of wire, has a length of 10 cm, and a radius of 5 cm. a) (10 pts) What i
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رن) B = lo ni Where lo=40X10-7 T/m, h=ho- of turns per unit length I Current in the solenoid. putting all values B= 40x107x 1soln (a) = lont, no no. of turnsber unit length B = 40x107x 100 x0.5 B= 6280x107T or B=0.63mT (b) one turn has 200 longth u 1

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