current to enter the wire. As long as the magnet and the coil move relative to each other‚ a potential difference is produced across the coil and current flows in the coil. A potential difference is also produced if the magnetic field through the coil grows stronger or weaker. The greater the rate at which the magnetic force through the coil changes‚ the greater the potential difference is produced. The key is that the magnetic field through the coil must be changing. Michael Faraday‚ an English scientist
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different technologies. • Speakers and Microphones: Most speakers employ a permanent magnet and a current-carrying coil to convert electric energy (the signal) into mechanical energy (movement which creates the sound). The coil is wrapped around a bobbin attached to the speaker cone‚ and carries the signal as changing current which interacts with the field of the permanent magnet. The voice coil feels a magnetic force and in response moves the cone and pressurizes the neighboring air‚ thus generating sound
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chapter you will be able to: 1. State the principle by which generators convert mechanical energy to electrical energy. 2. State the rule to be applied when you determine the direction of induced emf in a coil. 3. State the purpose of slip rings. 4. State the reason why no emf is induced in a rotating coil as it passes through a neutral plane. 5. State what component causes a generator to produce direct current rather than alternating current. 6. Identify the point at which the brush contact should change
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4.7 Review 1. In Alberta the north end of a compass needle points to (approximately) the geographic a. north b. south c. east d. west 2. An negatively charged droplet travels at a speed of 2.0 x 103 m/s. The field(s) that acts on this droplet is/are a. electrical only b. electrical and magnetic only c. magnetic and gravitational only d. electrical‚ magnetic‚ and gravitational 3. A charged particle experience a magnetic force only when it a. moves in the same direction
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flow rates of air to be pushed into the ducting system and the sizing of the major system components. Approaches to Temperature Control Temperature control in an air conditioning system is achieved by passing the air through the cooling or heating coil‚ which may use any of the following approaches: 1. Vary the temperature of air supplied to the space while keeping the airflow rate constant. This is the basic constant volume‚ variable temperature approach. 2. Vary the airflow rate while keeping
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PHYSICS HIGHER SECONDARY SECOND YEAR VOLUME - I Revised based on the recommendation of the Textbook Development Committee Untouchability is a sin Untouchability is a crime Untouchability is inhuman TAMILNADU TEXTBOOK CORPORATION COLLEGE ROAD‚ CHENNAI - 600 006 c Government of Tamilnadu First edition - 2005 Revised edition - 2007 Dr. S. GUNASEKARAN Reader Post Graduate and Research Department of Physics Pachaiyappa’s College‚ Chennai - 600 030 CHAIRPERSON Reviewers P SARVAJANA
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ship of Caribbean refugees came to port. With them‚ they carried the yellow fever virus. The virus traveled slowly at first; with just a few fatalities in the first week‚ numbers grew steadily over time. No one suspected it was the aedes aegypti mosquito‚ retrieving the blood of an infected victim and transferring it to another healthy individual. The city’s leading physician Dr. Benjamin Rush had never seen anything like it before.[3] Three to six days after being infected with the virus‚ the victim
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Launch of Bangladesh’s First Long Lasting Impregnated Net (LLIN) Plant • Plant located in Social Business Industrial Park in Sarabo‚ Kashimpur‚ Gazipur • Focus on production and marketing of specially treated mosquito nets‚ under brand name Interceptor® utilizing BASF’s technology Dhaka‚ Bangladesh – March 23‚ 2012 – BASF Grameen Limited‚ a social business joint venture between BASF‚ the world’s leading chemical company‚ and Grameen Healthcare Trust of Bangladesh‚ can now source
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Philadelphia doctors and the French. The fever was spreading like a swarm of bees going flower to flower. Yellow fever started in 1793. Ships brought infected mosquitos to Philadelphia and because of this became a horrible disaster that killed 2000-5000 people. Once the mosquito bites a person it draws blood from the person and then the mosquito bites another person where it releases the blood from the other person and then the infection starts. The doctors played an important role in treating yellow
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First of all‚ use the second right hand rule to find the north pole of the coil. Doing this we determine that the north pole is the left end. Since we are pulling the north pole away from the loop‚ the right side of the loop must become a south pole (in order to try and pull the coil back). This means that current must have been induced in a direction up the front of the loop. 3. The magnetic flux through a coil of wire containing 2 loops changes from -20 Wb to +15 Wb in 1.4 s. What is the
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