Example Problems Ch 20

# Example Problems Ch 20 - Example Problems Chapter 20 Q1 A...

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Example Problems: Chapter 20 Q1: A solenoid 4.00 cm in diameter and 20.0 cm long has 250 turns and carries a current of 15.0 A. Calculate the magnetic flux through the circular cross-sectional area of the solenoid. A: The magnetic field generated by the current in the solenoid is ( 29 ( 29 7 2 0 250 4 10 T m A 15.0 A 2.36 10 T 0.200 m B nI μ π - - = = × = × , and the flux through each turn on the solenoid is cos B BA θ Φ = ( 29 ( 29 2 2 2 4.00 10 m 2.36 10 T cos0 4 - - × = × ° = 5 2 2.96 10 T m - × Q2: A circular coil of radius 20 cm is placed in an external magnetic field of strength 0.20 T so that the plane of the coil is perpendicular to the field. The coil is pulled out of the field in 0.30 s. Find the average induced emf during this interval. A: ( 29 ( 29 cos 0.20 T cos0 0.20 T i B = ° = and ( 29 ( 29 cos 0 cos0 0 f B = ° = Thus, ( 29 ( 29 ( 29 2 2 0.20 T 0.20 m cos 8.4 10 V 0.30 s B B A t t ε - ∆Φ

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## This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Example Problems Ch 20 - Example Problems Chapter 20 Q1 A...

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