CBSE Class 12-science Answered
an air core solenoid with length 30 cm, area of cross-section 25cm sq and number of turns 500 carries a curent of 2.5A , the current is suddenly switched off in a brief time 10 raise to -3 secs . How much is the average back emf induced across the open switch in the circuit ?
Asked by rutujasarangmehta | 15 Mar, 2016, 08:25: AM
Expert Answer
Length of the solenoid, l = 30 cm = 0.3 m
Area of cross-section, A = 25 cm2 = 25 × 10−4 m 2
Number of turns on the solenoid, N = 500
Current in the solenoid, I = 2.5 A
Current flows for time, t = 10−3 s
Hence, the average back emf induced in the solenoid is 6.5 V.
Answered by Yashvanti Jain | 15 Mar, 2016, 11:34: AM
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