3. a) A 14 turns circular coils is placed on a paper which lies in 1.2 T magnetic field pointing inwards to the paper. The coil's diameter changes from 22.5 cm to 7.2 cm in 1.8 s. i) Determine the induced current. ii) Calculate the magnitude of the emf induced in the circuit. iii) Calculate the induced current if the circular coil resistance is 7.5 2. b) A circular coil of N turns with current 9.4 mA has inductance 15 mH. Calculate the i) magnetic flux linkage through the coil ii) radius of the coil if N = 420 turns

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question a and b

3. a) A 14 turns circular coils is placed on a paper which lies in 1.2 T magnetic field
pointing inwards to the paper. The coil's diameter changes from 22.5 cm to 7.2 cm in
1.8 s.
i) Determine the induced current.
ii) Calculate the magnitude of the emf induced in the circuit.
iii) Calculate the induced current if the circular coil resistance is 7.5 2.
b) A circular coil of N turns with current 9.4 mA has inductance 15 mH. Calculate the
i) magnetic flux linkage through the coil
ii) radius of the coil if N = 420 turns
c) A solenoid of inductance 73. mH has a 450 turns and length 24 cm. Determine the
i) cross sectional area of the solenoid
ii) induced emf in the solenoid if its current drops from 3.2 A to zero in
55 ms.
Transcribed Image Text:3. a) A 14 turns circular coils is placed on a paper which lies in 1.2 T magnetic field pointing inwards to the paper. The coil's diameter changes from 22.5 cm to 7.2 cm in 1.8 s. i) Determine the induced current. ii) Calculate the magnitude of the emf induced in the circuit. iii) Calculate the induced current if the circular coil resistance is 7.5 2. b) A circular coil of N turns with current 9.4 mA has inductance 15 mH. Calculate the i) magnetic flux linkage through the coil ii) radius of the coil if N = 420 turns c) A solenoid of inductance 73. mH has a 450 turns and length 24 cm. Determine the i) cross sectional area of the solenoid ii) induced emf in the solenoid if its current drops from 3.2 A to zero in 55 ms.
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