39 and 40 39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. Ifthe resistance of the coil of the motor is 102, the current which flows through it isA. 1.2 AC. 11.0 AB. 9.8 AD. 20.8 A40. A solenoid of length 15.0 cm with 2500 turns is placed coaxially in side the solenoid. Thesolenoid is a coil of cross sectional area 4.2 cm? which has 50 turns. What is the mutualinductance of the arrangement?A. 9.9 mHC. 0.89 mHB. 5.0 mHD. 0.44 mH

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39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 10 Q, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A

39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 10 Q, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter14: Inductance

Section: Chapter Questions

Problem 76AP: Suppose that a cylindrical solenoid is wrapped around a core of iron whose magnetic susceptibility...

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Question

39 and 40

39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If
the resistance of the coil of the motor is 102, the current which flows through it is
A. 1.2 A
C. 11.0 A
B. 9.8 A
D. 20.8 A
40. A solenoid of length 15.0 cm with 2500 turns is placed coaxially in side the solenoid. The
solenoid is a coil of cross sectional area 4.2 cm? which has 50 turns. What is the mutual
inductance of the arrangement?
A. 9.9 mH
C. 0.89 mH
B. 5.0 mH
D. 0.44 mH

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