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Posted: **Sun Jul 03, 2022 12:14 pm**

: Q1 A Magnetic Circuit In The Form Of A Ring Is Shown In Figure Q1 100 Ma 300 Turns Coil 8cm 1 10cm Cross Sectional 1 (31.76 KiB) Viewed 15 times

: Q1 A Magnetic Circuit In The Form Of A Ring Is Shown In Figure Q1 100 Ma 300 Turns Coil 8cm 1 10cm Cross Sectional 2 (20.8 KiB) Viewed 15 times

: Q1 A Magnetic Circuit In The Form Of A Ring Is Shown In Figure Q1 100 Ma 300 Turns Coil 8cm 1 10cm Cross Sectional 3 (20.81 KiB) Viewed 15 times

Q1. A magnetic circuit in the form of a ring is shown in Figure Q1: 100 mA 300 turns coil = 8cm 1₂=10cm Cross-sectional area A = 10 cm² Figure Q1 (a) Determine the magnetomotive force (F) produced by the coil; Calculate the average magnetic field strength (H) in the ring; (b) (c) If the relative magnetic permeability (44) of the ring material is 1000, find the average magnetic flux density (B) in the ring; Given 14-47 x 107 H/m. Answers: (d) Determine the total flux (6) in the ring; (e) Determine the direction of magnetic flux within the ring.
Q2. (a) For the below waveforms: 20 V SA 0.1 ms f = 833.3Hz (i) Draw the phasors, phasor length uses the amplitude of the waveform. (ii) What is the phase difference between these two phasors? Which phasor leads? (iii) Write the equations as a function of time for the above waveforms. (b) (i) Given v= 5 sin(232r +45°) V. Find f= ? And what is v at 1=20 ms? (ii) Draw the waveform of (i) with the horizontal axis scaled in degrees. Answers:
Q3. (a) (i) Find the total inductance L, of Figure 3a. 102 M 50 V Figure 3a Answers: 14 H 9H (ii) Calculate the current drawn from the supply: (iii) Calculate the total energy stored by the inductors of Figure 3a. (b) The DC current passing through a 60 mH coil increases uniformly from 10 mA to 40mA within 2 seconds. Calculate: (i) The rate of change of current within these 2 seconds. (ii) The voltage induced in the coil within these 2 second.