piece of soft iron attached to each end of the magnet. The iron is also magnetized. The iron ends of the magnet serve to direct the magnetic field in the direction of a small iron cylinder that is positioned between the ends (or poles) of the magnet. Taking advantage of the soft iron’s characteristic to become highly magnetized‚ the iron cylinder focuses the magnetic field. The Electrical Current Surrounding the cylinder is a rectangular frame with a copper wire coil‚ with the ends of the wire attached
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GENERAL INSTRUCTIONS: A: The numerical are based on application of theory content. Attempt them in your physics notebook as practice assignment. B: Do all questions in sequence. UNIT –I: ELECTROSTATICS 1. Three identical charges each +q are placed at the corners of an equilateral triangle of side d cm. Calculate the force on a +ve charge +2q at the centroid of the triangle. 2. Force acting on a charged particle kept between the pair of plates‚ having equal and opposite charge‚ is F. If
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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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nonmagnetic and and is placed in a uniform magnetic field of magnitude B0 . The coil sides are of radius R and are uniformly spaced around the rotor surface. The first coil carrying a current I1 and second coil carrying a current I2 . Assuming that the rotor is 0.30 m long‚ R=0.13 m‚ and B0 = 0.85 T‚ find the Θ directed torque as a function of rotor position α for (a) I1 =0A and I2 =5A‚ (b)I1 =5A and I2 =0A‚ and (c)I1 =8A and I2 =8A. Uniform magnetic field‚ B 0y r θ Ι2 Ι1 R α
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of windings to which three-phase electrical power is applied. The stator field can be visualized as a set of north and south poles rotating around the circumference of the stator. (North stator poles are where magnetic flux lines leave the stator‚ and south stator poles are where magnetic flux lines enter the stator.) Because north and south poles occur in pairs‚ the total number of poles P is always even. The direction of rotation of the field in a three-phase induction machine can be reversed by
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Through research I discovered that there are animals that have senses that by far exceed our five human senses. One of the animals would be the bat that we spoke about in class. Bats avoid obstacles and nab insects on the wing by emitting ultrasonic squeaks and interpreting the echo the sound waves make after bouncing off objects in the environment. This is called "echolocation‚" but bats aren’t the only animals that use echolocation. Dolphins also use echolocation to navigate themselves in murky
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10.2 Properties of Cathode rays Aim: to determine some of the properties of the rays which come from the cathode of a discharge tube. Equipment * Two power packs * Two plug-plug leads * One pair of magnets * Induction coil * Four plug-clip leads * Discharge tubes (Maltese cross‚ electric plates‚ rotating wheel‚ screen display) Theory: This experiment is designed to show you the properties of cathode rays as discovered by Sir William Crookes. Method: 1. Connect the
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CBSE XII | PHYSICS Sample Paper - 1 CBSE Board Class XII Physics Sample Paper - 1 Time: Three Hours Maximum Marks: 70 General Instructions (a) All questions are compulsory. (b) There are 29 questions in total. Questions 1 to 8 carry one mark each‚ questions 9 to 16 carry two marks each‚ questions 17 to 25 carry three marks each and questions 27 to 29 carry five marks each. (c) Question 26 is a value based question carrying four marks. (d) There is no overall choice. However‚ an internal choice
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MINISTRY OF EDUCATION FIJI SEVENTH FORM EXAMINATION – 2004 EXAMINER’S REPORT PHYSICS GENERAL COMMENTS PAPER I The format for 2004 FSF Physics Examination paper has been similar to 2003 . The examination paper on the whole had tested knowledge and concepts expected to be learned by seventh form physics students in Fiji‚ particularly : - familiarity with basic concepts ; - problem solving techniques ; - knowledge of practical situations encountered during practical lessons
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Electrodynamic Wattmeter The electrodynamic wattmeter is used to measure (Useful) power taken from ac power supplies. The electrodynamic wattmeter uses the reaction between the magnetic fields of two current-carrying coils‚ one fixed and the other movable. The voltage and current coils are wound around a laminated iron core to produce a magnetic field across the air gap. When the current through the fixed-position field windings is the same as current through the load and the current through the moving coil
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