# Lec-13 - Previous Lecture dc motor Biot-Savart Law B of a...

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Previous Lecture dc motor Biot-Savart Law B of a current loop – p.

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Today Results of Exam Ampere’s Law Magnetic materials – p.
Results of HT-1 Score Number of Students mean 61 range 13 - 99 – p.

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Results of HT-1 Score Number of Students mean 61 range 13 - 99 A B C – p.
Ampere’s Law I B · d l = µ 0 I encl The line integral of B around a closed loop is equal to µ 0 times the current that passes through the loop. – p.

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B of a Solenoid (1) – p.
B of a Solenoid (2) Solenoid has n turns/meter, so for length l there are a total of N turns, where N = nl. Apply Ampere’s Law to dashed loop: I B · d l = Z b a B · d l | {z } neglect + Z c b B · d l | {z } B d l + Z d c B · d l | {z } BL + Z a d B · d l | {z } B d l I B · d l = Bl = µ 0 NI = µ 0 nlI B = µ 0 nI – p.

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B of Toroid N = number of loops Path 1 (inside toroid): I B · d l =2 πrB = µ 0 I encl I encl = NI B = µ 0 NI 2 πr = µ 0 nI where n = N/ 2 πr Path 2 (outside toroid): I B · d l =2 πrB =0 B =0 – p.
Different kinds of magnetism Ferro-, Para-, Dia- – p.

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## This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Lec-13 - Previous Lecture dc motor Biot-Savart Law B of a...

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