Q4. A cylindrical pot magnet is shown in Fig. b. The coil, which has 1000 turns and a resistance of 20 22, is connected

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Q4 A Cylindrical Pot Magnet Is Shown In Fig B The Coil Which Has 1000 Turns And A Resistance Of 20 22 Is Connected 1 (96.01 KiB) Viewed 20 times

Q4. A cylindrical pot magnet is shown in Fig. b. The coil, which has 1000 turns and a resistance of 20 22, is connected to a constant-voltage source of 60 V DC. The plunger passes the point at which the airgap is 10 mm travelling upwards with a uniform velocity of 2.0 m/s. Make an estimate of the value of the current at this instant, assuming that the initial airgap length was 15 mm. Apportion the instantaneous input power into heat, magnetic-energy storage-rate and mechanical components. Hence estimate the magnetic force on the plunger. Ans: 80 W, -78.4 W, 118.4 W, 49.2 N [ Airgap 50 mm dia Fig. b Coil 59