Consider a long (practically infinite) straight wire of radius, a, carrying a steady current that is uniformly distributed over its cross section as shown in the figure. Which of the following is FALSE? Contour C₂ for r₂a (a) Cylindrical wire (b) Wire cross section Contour C₁ for ra B © The magnitude of the magnetic field intensity, H, inside the wire is proportional to the distance,,, from the wire axis. The magnitude of the magnetic field intensity, H, on the surface of the wire (ra) is inversely proportional to a². The magnitude of the magnetic field intensity, H, outside the wire is inversely proportional to the distance, r, from the wire axis. The magnitude of the magnetic field intensity, H, outside the wire is proportional to the current, 7, on the wire.

A ten-turn solenoid has a ferromagnetic core with a relative permeability of 10,000. The length of the solenoid is l=10 cm and its cross section area is A=1 cm2.  The amount of current driving the solenoid is 0.1 A.  Determine the magnetic flux intensity H in the core. Provide your answer in A/m.  Round off to your answer to one decimal.

A three-legged ferromagnetic magnetic core with the coil dimensions shown below has a of 500 turns wrapped around the right leg. The core relative permeability is 4000 times, The magnetic flux in the left leg of the core has a value of 40 mWb. The center leg has an air gap of 0.8 mm, its fringing effect is neglected. Draw the corresponding magnetic circuit and find the values of the coil current i, and the flux in each leg of the core. cm 10 cm, 25cm 25 cm 10 cm 10 cm 25 cm 0.8 mm 500 turns 10 cm Core depth = 10 cm

A square magnetic core has a mean length of 43 cm and a cross-sectional area of120cm2. A coil of 200 turns of wire is wound around one of the columns of the core, thewhich is made of a material whose required magnetic field strength is H=115 Aturns/m. a) How much current is required to produce a flux of 0.012 Wb, in the core?b) What is the relative permeability of the core for that current?c) What is the reluctance?

electromagnatic

you these questions. The dimensions of a ferromagnetic core are shown in the figure below. Assuming the core is built from an ideal material with an infinite permeability, consider that the coil has 1000 turns, and the core cross-section is 250 mm². Given that the permeability of free space = 4 x 10-7 H/m, answer the following questions: a) Calculate the total reluctance of the flux path. b) Determine the magnetomotive force when the current flowing in the coil is 150 mA. c) What is the magnitude of the flux produced by a current of 10 A in the coil? d) Plot the direction of the flux in the figure, 1mm considering the direction of the current in the coil. e) Sketch the Magnetic Circuit, labeling each component with its corresponding value. 2 mm 5 mm 3 mm 3 mm 5 mm

(a) Given a magnetic circuit as shown in Figure Q3(a)(i) where the core is a cast steel. B- H curve for the cast steel is shown in Figure Q3(c)(ii). The center limb has a cross- sectional area of 600 mm² and each of the side limbs has a cross sectional area of 450 mm?. A coil of 200 turns is wound on the central limb. Neglect any magnetic leakage and fringing effect. You are required to provide the equivalent Ampere's Cireuital Law model with the detail of the labelling and also investigate the m.m.f. and current values that are required to establish a flux of 8.4 x 104 Wb in the centre limb. mm 250 mm 250 mm 100 mm Figure Q3(a)(i) B (T) 1.6 Sheet steel Cast steel 1.4 1.2 1.0 0.8 Cast iron 0.6 0.4 0.2 H(Alm) 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Figure Q3(a)(ii) 班

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d. Find the magnitude of the magnetic field due to wire2 at the location of field point e. Find the unit directions for f and i and perform the cross product to detemine the direction of the magnetic field due tó wire2 at the location of field point P. 1. Find the magnitude of the magnetic field due to wiret at the location of field point P

A ferromagnetic core with a relative permeability of 1500 is shown in the Figure. The dimensions are shown in the diagram, and the depth of the core is 5cm. The air gaps on the left and right sides of the core are 0.050 and 0.070 cm, respectively. Because of the fringing effects, the effective area of the air gaps is 5 percent larger than their physical size. If there are 300 turns in the coil wrapped around the center leg of the core and if the current in the coil is 1.0 A, what are the flux values for the left, center, and right legs of the core? What is the magnetic field in each air gap? |7 cm 7 cm 7 cm to 30 cm 30 cm 7 cm 30 cm 0.07 cm 300 turns 0.05 cm 7 cm Core depth = 5 cm