The full-scale deflecting torque of a 20 A moving-iron ammeter is 6 x 10¹5 N-m. What is the rate of change of self-inductance with respect to the deflection of the pointer of the ammeter at full scale?
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- While discussing electric motors: Technician A says that when there is high CEMF, there will be high cur-rent flow. Technician B says that if the reluctance of an electromagnet increases, its field strength increases. Who is correct?A moving iron ammeter produces a full scale torque of 240 µN-m with a deflection of 1200 at a current of 10 A. The rate of change of self inductance (µH/radian) of the instrument at full scale is ??The permeability of an annealed iron core is 5600 × 10-6 Tm/At when the current is 80 mA. The coil consists of 200 turns on core 20 cm in length. Find (a) the field intensity, (b) the flux density, and (c) its relative permeability.
- A solenoid similar to the figure below, has a core made of cast steel (refer to the figure on the next slide). It has a cross-sectional area of 4cm2 and a mean length of 20cm. The coil has 100turns, and the coil current is 3.2A. Find the following: a)magnetomotive force, mmf b)magnetic field intensity, H c)flux density, BA magnetic circuit consists of silicon steel of 3000 permeability and an air gap. The length of the steel core is 10cm and the air gap is 2 cm. Both have the same cross-section of 1.5 sq.cm. A current of 1/4 A flows through the windings to produce 2351 maxwells flux. How many turns are there in the coil? Answer: ______ turnsThe coil of a moving-coil voltmeter is25 mm long and 25 mm wide and has 60 turns on it. The control spring exerts a torque of 1.58 x 10 Nm when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the air gap is 5 wb/m², estimate the resistance that must be put in series with the coil to give one volt per division. The resistance of the voltmeter coil may be neglected
- . To stretch a spring 3.00 cm from its unstretched length, 12.0 J of work must be done. (a) What is the force constant of this spring? (b) What magnitude force is needed to stretch the spring 3.00 cm from its unstretched length? (c) How much work must be done to compress this spring 4.00 cm from its unstretched length, and what force is needed to compress it this distance?A coil with 2000 turns has a length of 20mm and a winding thickness of 5mm. If the coil carries 5mA current, which of the following is the value of mmf (magnetomotive force) produced? Please choose one: a.2000 A.t. b. 500 A.t C. 10 A.t. D.NoneA 100-turn coil wound on a magnetic core is found to have an inductance of 200 mH. What inductance will be obtained if the number of turns is increased to 200, assuming that all of the flux links all of the turns?
- The reluctance of a non-magnetic path is 12 AT-Wb. Find the flux needed to be set up if surrounded by a coil 600 turns carrying a current of 3 A.Explain the hysteresis that can be found in materials due to force, magnetic and electrical subjection (give an example on two different materials) high carbon stainless steel.A coil is wound uniformly with 500 turns over a steel ring of relative permeability 900, having a mean diameter of 40 mm cut with air gap 0.2 mm and cross-sectional area of 50 mm2 and the flux density in it 0.5T. Find the current of passed through the coil and total .reluctance of ring