A current carrying conductor placed in a magnetic field experience a force, is it true for generators? Select one: O True O False
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A: Formula to calculate magnetic field B is: B=μ0×I2π×r
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- The emf generated by a dc generator depends upon both the flux and speed. Select one: True FalseWhich of the following configurations can be used to apply Ampere's circuital law ? f the length of a solenoid is doubled but the number of turns is halved, the magnetic field inside will Ɔ cut by 1/2 Ɔ cut by 1/4 Ɔ Quadrable Ɔ Double A B None of the above C D ... ... O Only A Only A & B & C .... .... ... . Only D O All of them None of the aboveBiot-Savart law expresses the magnetic flux intensity produced by a dc electrical current Select one: O a. True b. None of the above O c. False
- 5-5.When one coil of a magnetically coupled pair has a current 5.0 A the resulting fluxes ?11and ?12 are 0.2mWb and 0.4mWb, respectively. If the turns are N1= 500 and N2=1500, find L1, L2, M, and the coefficient of coupling kThe flux linking to 200 turns coil changes from 2 mWb to 5 mWb in 1ms to 3 ms. Determine the induced voltage.* 300 V 400 V 500 V 600 V What is the magnetomotive force created when 5 A current flows through 300 turns coil? * 1000 At 2000 At 1200 At 1500 At1. What is the relationship between voltage and current when there is saturation in the magnetic circuit? 2. When there is no saturation in the magnetic circuit, what is the relationship between voltage and current? 3. Briefly explain what caused the saturation in the magnetic circuit. 4. What happens to alternating current, alternating current, and alternating magnetic flux in a magnetic circuit when frequency increases? 5. When a magnetic circuit is saturated, explain two solutions that can be used so that the magnetic circuit is no longer saturated.
- In a certain magnetic circuit, the core is represented two reluctances as shown below. Assume a relative permeability r = 2500, and a number of turns N = 420 turns. Find the current needed to produce a flux of 10 mWb in the core. Fi Select one: a. i 95 mA O b. i 0.95 A O c. i 0,226 A O d. i 9.5 mA Oe. None RI E =15624 A.t/Wb Rgap = 24.2 KA.t/WbThe length of a magnetic circuit in a moving iron instrument is 300mm. The coil around the soft iron core has 360 turns and takes a current of 1.75 A. The core is square in section with sides of 20mm. Take the relative permeability of soft iron as 1100. Determine the total fluxA magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core is