9 A cylinder of infinite length, with cross-sectional radius R, has a "frozen" magnetization parallel to its axis, M = ksz, where k is a constant and s the distance from axis, while there are no free currents at all. Find the magnetic field inside and on the outside of the cylinder by the following two methods: (A) Locate all the stray currents and find the magnetic field B they produce. (B) Use Ampere's law to find H and then B.

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 core with three legs is shown in the figure below. The depth of the core is 5cm, and there are 100 turns on the leftmost leg. The relative permeability of the core can be assumed to be 2000 and constant. What flux exists in each of the three legs of the core? What is the magnetic field in each of the legs? Assume a 5percent increase in the effective area of the air gap due to fringing effects. 9 cm 9 cm 25 cm 15 cm -25 cm 9 cm 2 A 100 turns 0.05 cm 25 cm 9 cm Core depth = 5 cm

A coil has a field intensity at 300 At. Its length is doubled from 20 to 40 cm for the same magnetomotive force. What is the new magnetic field intensity?

A ferromagnetic core with a relative permeability of 1500 is shown in the following figure. The depth of the core is 5 cm. Because of 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 1.25 A, find the magnetic flux and the field density in all three legs of the core, as well as the magnetic flux and flux density in the two air gaps.

A magnetic core with an air gap is shown below. For a relative permeability is 3500, and the space free permeability is 4x10-7 H/m. Find the reluctance of the left leg and the top side of the core. 5 cm gap 0.15 cm Select one: a. 40 cm N core depth = 10 cm O b. Rleft = 13.642 C. None 5 cm 1 5 cm 20 cm 15 cm Rleft = 1364.2 A.t./Wb, Rtop = 2045.5 A.t/Wb KA.t./Wb, Rtop = 20.455 KA.t/Wb d. Rleft = 20.455 KA.t./Wb, Rtop = 13.642 KA.t/Wb Oe. Rleft = 1.36 KA.t./Wb, Rtop = 2.05 KA.t/Wb

Please help me with this question.

Consider the circuit in the figure (b). The curved segments are arcs of circles of angle 350 and radii a = 30 cm and b = 15 cm. The straight segments are along radii. Find the magnetic field B at point P (the center of curvature), assuming a current of 18 A clockwise in the circuit. (Positive out of page and negative into page) a R2 Ө b R1 P A H C J D (b) (a)

Q4// A ring of a mean diameter 30 cm and cross sectional area of 15 cm2 is made up of semi – circular sections of cast iron and cast steel. If each joint has an air gap of 0.25 mm. Find amper turns required to produce a flux of 7 x 10 weber in the magnetic circuit. The relative permeability of steel and iron are 852 and 165 respectively. - OA- Amper turns required= 1105 OB- Amper turns required= 1995 OC- Amper turns required= 2250 OD- Amper turns required= 3150 OE- None of above ارسال الاجابة

A thin conducting wire is bent into the shape shown in the figure. The circular portion of the wire has radius R. The wire is in the plane of the screen and carries a current I. R (a) What is the direction of the magnetic field at the center of the loop? O to the left O to the right O upward O downward O into the screen O out of the screen (b) Find an expression for the magnitude of the magnetic field at the center of the loop. (Use the following as necessary: R, I, and Ho. Do not substitute numerical values; use variables only.) B =