a circuit with 12 volts and 5 ampers the restiance would be ________ ohms. A.) 2.4 16.) Soft iron used in the laminations of a coil or transformer has_____________. A.) a 17.) What happens when a coil of wire is passed through a magnetic field? A.) Magnetic field is cut by the wire and current will flow. 18.) What happens when electric current is passed through a coil or
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| Two small spheres‚ each with mass m = 3.0 g and charge q‚ are suspended from a point by threads of length L = 0.22 m. What is the charge on each sphere if the threads make an angle = 15º with the vertical? | | A) 0.79 C B) 2.9 C C) 75 mC D) 6.3 C E) 0.11 C | | | | Three charges‚ each of Q = 3.2 10–19 C‚ are arranged at three of the corners of a 20-nm square as shown. The magnitude of the electric field at D‚ the fourth corner of the square‚ is approximately
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reaction. Much of the energy people depend on comes from chemical reactions. For example‚ energy can be obtained by burning fuel‚ metabolizing of food or discharging a batter. Materials and Methods: All work was done with coffee cup calorimeters‚ magnetic mixers‚ standard glassware and hardware. Weights of all materials were obtained using a Metler Toledo electronic scale per the manufacturer’s recommended procedure. Heating of reactants was done with a Thermolyne Type 1900 hot plate set to 500
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example there is no electric current. The electric field produces a force on other charges in its vicinity. Moving charges additionally produce a magnetic field. Electric potential is the capacity of an electric field to do work on an electric charge‚ typically measured in volts. Electromagnets are electrical currents generate magnetic fields‚ and changing magnetic fields generate electrical currents. Electrical phenomena have been studied since antiquity‚ though advances in the science were not made
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forces are generated from changing magnetic fields. This problem is a prototypical example in which an increasing magnetic flux generates a finite line integral of the electric field around a closed loop that surrounds the changing magnetic flux through a surface bounded by that loop. A cylindrical iron rod with cross-sectional area is oriented with its symmetry axis coincident with the z axis of a cylindrical coordinate system as shown. It has a uniform magnetic field inside that varies according
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Thales of Miletus‚ who lived from about 625 BC to about 545 BC.[1] Around the same time‚ in ancient India‚ the Indian surgeon‚ Sushruta‚ was the first to make use of the magnet for surgical purposes.[2] There is some evidence that the first use of magnetic materials for its properties predates this‚ J. B. Carlson suggests that the Olmec might have used hematite as a magnet earlier than 1000BC[3] [4] In ancient China‚ the earliest literary reference to magnetism lies in a 4th-century BC book named
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to measure the linear displacement of an object in a magnetic field is presented. The application is to be safely used for demonstration purposes in the Playpen laboratory. The system uses an array of five HMC1501 Magnetoresistive (MR) sensors to sense the position of a magnet attached to the moving object. The system also has the ability to monitor the ambient operating temperature and detect if it is exposed to an external disturbing magnetic field. Several other components such as the differential
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induction followed by resonant magnetic induction. Other methods under consideration include electromagnetic radiation in the form of microwaves or lasers. Energy transfer and efficiency The general principle is that if a given oscillating amount of energy (for example alternating current from a wall outlet) is placed into a primary coil which is capacitively loaded‚ the coil will ’ring’‚ and form an oscillating magnetic field. The energy will transfer back and forth between the magnetic field in the inductor
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Practical Activity – Lenz’s Law Syllabus: 2.7‚ 2.5‚ 2.6 Aim – What is the effect of Lenz’s law? How does Lenz’s Law work? Risk Rating Minimisation 1. Skin pinched by magnet Low Don’t bring the magnets together and don’t try and hold them apart. Don’t try and separate the rare earth magnets. 2. Hit by swung pole Low When holding the pipe‚ make sure the it is perpendicular to the ground and keep clear of any surrounding people Procedure – 1. Collect a 1m plastic‚ metal and another metal
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| Maximizing the Range and Power of Inductive Coupling | | | Isaiah Anderson | 1/11/2013 | | Abstract In this project I studied how an electrical current moving through a coil of wire can generate an electric magnetic field and power an electrical load connected to a similar coil of wire. This experiment has been performed before but the goal of this project was to increase the efficiency of the circuit. In this experiment multiple different coils were tested in order to find
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