A field of strength 5 × 10 ampere turns / meter acts at right angles to the coil of 50 turns of area 102m². The coil is removed from the field in 0.1 second. Then the induced e.m.f. in the coil is :
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- A capacitor uses air as a dielectric and has a capacitance of 3 F. A dielectric material is inserted between the plates without changing the spacing, and the capacitance becomes 15 F. What is the dielectric constant of this material?A coil of 1000 turns is uniformly wound on a ring of non-magnetic material, the mean diameter is 20cm. The cross-sectional area of the coil is 4 cm2. Determine the self-inductance of the coil.A conducting coil, with current i(t) = 4.40e−0.0250t sin(120πt), with i in amperes and t in seconds, is placed next to a second coil, end to end. At t = 0.720 s, a lab tech measures the emf across the second coil, and the result is −3.50 V. What is the mutual inductance (in mH) of the coils?
- A. A coil of 1000 turns is uniformly wound on a ring of non-magnetic material, the mean diameter being 20 cm. The cross-sectional area of the coil is 4 cm2. Determine the selfinductance of the coil.A solenoid coil needs to be manufactured which produces an inductance of at least 2000 Gauss (in SI system = Tesla) when a 10mA current flows through the conductor. Due to space limitations, the coil should be composed of 10 turns over a 1cm length. Do the required calculations and select a core material for the coil from the table below. Your answer will be given over the following series of questions. A. H = 0.12566 oersted B. H = 12.56637 oersted C. H = 1.25664 The relative permeability of the manufactured solenoid from the previous question is: A. μr = 15.916 B. μr = 15915.964 C. μr = 1.2665e10 D. None of the mentioned/ Geen van die genoemdeA solenoid coil needs to be manufactured which produces an inductance of at least 2000 Gauss (in SI system = Tesla) when a 10mA current flows through the conductor. Due to space limitations, the coil should be composed of 10 turns over a 1cm length. Do the required calculations and select a core material for the coil from the table below. Your answer will be given over the following series of questions. A. H = 0.12566 oersted B. H = 12.56637 oersted C. H = 1.25664
- A coil of resistance 100W is placed in a magnetic field of 1mW. The coil has 100 turns and a galvanometer of 400W resistance is connected in series with it. Find the average emf and the current if the coil is move in 1/10th second from the given field to a field of 0.2mWb.What effect (increase or decrease) would the following changes have on the inductance of a coil?(Justify your answer) Increasein the number of turns of wire Removal of its iron coreA tube has been wounded with a solenoid of 700 mm length. Calculate the number of turns necessary over the solenoid to produce a field strength of 400 AT/m at the center of the coil. The current through the coil is 0.5 A.
- A. A coil of 1000 turns is uniformly wound on a ring of non-magnetic material, the mean diameter being 20 cm. The cross-sectional area of the coil is 4 cm2. Determine the selfinductance of the coil. Ans. 0.8mH B.An iron core 0.4m long and 5 cm2. In cross section, is wound with 300 turns. When a current of 0.5 A flows in the coil, how much is the inductance of the coil. Assume the core has a permeability of 2500.The inductance of a coil of wire is a result of: Select one: the energy in the magnetic field around the coil. current induced in the coil. the coil time constant. relative motion.A 4-79 permalloy solenoid coil needs to produce a minimum inductance of 1.5 Wb/m^2. If the maximum allowed current is 8mA, how many turns are required in a wire 132cm long?