Permanent magnets are magnets
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- The 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 20 mm. Takethe relative permeability of soft iron as 1100. Determine the flux density18. What type of magnet depends on flowing current to produce a magnetic field? a. electromagnet gaiamn al 1otorn onoolo mA ES b. permanent magnet c. temporary magnet d. domain magnetThe 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 flux
- 16. This is the ability of the material to impede a flow in magnetic flux a. Resistance b. Permeance c. MMF d. ReluctanceThe 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 1.75A.The core is square in section with sides of 20mm.Take the relative permeability of soft iron as 1100. Determine the magnetomotive force in the core. Determine the field strength. Determine the flux density. Determine the total flux.The capacitor in the rectifier is chosen such that O a. Time constant CR is ten times of that AC output Supply O b. Time constant CR is ten times of that AC input Supply
- Magnets and Magnetic CircuitA)The left hand rule for a coil is such that if you were to hold a coil in your left hand with your fingers pointing in the direction of the electron flow, your thumb would point in the direction of thea) electron flow b) flow lines c) face of the north pole d) none of the above. B) What is a magnetic flux line?a) It is the space around a magnet or the space in which the magnetic forces act.b) It is the magnetic force that has a definite direction at all points along a curved line from the north to south pole.c) It is the ability of a magnetic material to be easily magnetized.d) none of the above C)It is believed that a magnetic material is .........a) consists of a single large magnetic molecule b) is composed of many tiny magnetic molecules c) consists of a single non-magnetic molecule d) none of the above1. A type material that is not affected by magnetic field. 2. If the number of turns is doubled, what will happen to the inductance? 3. It provides magnetic pressure which sets up or tends to setup flux in a magnetic.
- 1.Consider the magnetic core below.All dimensions are shown on the figure. The core is made up of legs with 2 different cross-sectional areas.The depth of core is 10cm.The relative permeability of the core is 2000. The current in the magnetising coil is 1 A. The number of turns of the coil is 2000.Calculate: (i)the reluctances and draw the magnetic circuit (ii)the flux in the core (iii)Flux densities B and field intensities H in legs having different cross-sectional areas. (iv)Verify Ampere's Law. Depth: 10 cm I=1A 20cm 2000 Turns 65cm 15cm 15cm 50cm 15cm ndo un ofDefine the following: Flux density Coercive force Residual magnetism SaturationMagnets and Magnetic Circuits