Question

19) A single turn coil of cross-sectional area 7.2cm^2 is in the a magnetic field of flux desity 0.45T. The field which is perpendicular to the coil, is steadily reduced to 0.0T in 5s. Calculate the induced emf.
a) 0:72ÖV
b) 0:52ÖV
c) 0:47ÖV
d) 0:65ÖV
20) What is the self - inductance of an air-core solenoid, 1m long and 0.05m in diameter, if it has 1400 turns?
a) 5.23mH
b) 4.84mH
c) 3.63mH
d) 2.42mH