Provided below are some handwritten notes on magnetic field in a solenoid and other important concepts. In physics and electromagnetism, Gauss's law, also known as Gauss's flux theorem, (or sometimes simply called Gauss's theorem) is a law relating the distribution of electric charge to the resulting electric field. The current flowing through the coil can be expressed by As the orientation of the area element also decides the amount of actual eclectic flux experienced, the area in the electric flux is a vector quantity. Here, the electric field outside ( r > R) and inside ( r < R) of a charged sphere is being calculated (see Wikiversity ). Other forms of equations for electric flux density are as follow: D E q/4r2. If it has 300 turns, determine the current flowing through it. Electric Flux Density Formula: The electric flux per unit area is called the electric flux density. The magnetic field generated by the solenoid is 8.505 × 10 −4 N/Amps m.Įxample 2: A solenoid of diameter 40 cm has a magnetic field of 2.9 × 10 −5 N/Amps m. The magnetic field in a solenoid formula is given by, Ampere’s Circuital Law Video ExplanationĪlso Read: Moving Charges and Magnetism MCQĮxample 1: Find out the magnetic field produced by the solenoid of length 80 cm under the number of turns of the coil is 360 and the current passing through is 15 A. The above equation is used to determine the magnitude of the magnetic field in a long solenoid. “The integration of a magnetic field around a loop is directly proportional to the current enclosed in the loop.” Since the field outside the solenoid is comparatively less than that it is present inside, we can consider it as zero as the length of the solenoid increases, and hence B = 0.Īlso Read: Parallel Current Carrying Conductor The magnetic field outside a solenoid is: For the entire number of field lines to be contained, the magnetic field outside must be zero, because the solenoid gets longer.
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