When a given current-carrying conductor is put in an exterior magnetic field, the conductor encounters a force perpendicular to the field and the current flow’s direction. The middle finger will then be in the direction of the generated current. Taking that the forefinger represents the direction of the magnetic field, the thumb will point in the direction of motion or involved force, Grab the Right-Hand forefinger, middle finger, and thumb at Right angles to each other. To perform the Right- Hand Rule, the following instructions should be followed. Fleming’s Right-Hand Rule specifies this relation between these 3 directions. If that electrical conductor is strongly dragged inside the magnetic field, there is an association between the direction of the involved force, magnetic field, and the current. When the charges start to move, the magnetic field pushes on the charges.įaraday’s law of electromagnetic induction states that when a moving electrical conductor is kept inside a magnetic field, a current will get induced in it. If the charges are still in an environment, they are unchanged by magnetic fields. One of the most important things to remember in the Right-Hand Rule is to always avoid using the Left Hand instead of the Right Hand which is common practice among many students. The Right-Hand Rule describes the magnetic fields and the forces that they exert on moving charges and conveys a simple method to remember the directions that things are supposed to point. The Formula containing more than one term which is added or subtracted likes \. The Formula containing exponential, trigonometric, and logarithmic functions can not be derived using this method. This method can be used only if dependency is of multiplication type. Using the principle of homogeneity of dimension, the new relation among physical quantities can be derived if the dependent quantities are known. To develop a relationship between different given physical quantities: This concept is best known as the principle of homogeneity of dimensions. If in a given relation, the terms of both sides have the same Dimensions, then the equation is dimensionally correct. To check the Dimensional correctness of a given physical relation: It is based on a fact that the magnitude of a physical quantity remains the same whatever system is used for measurement i.e magnitude = numeric value(n) multiplied by unit (u) = constant To convert a physical quantity from one system of the unit to the other: The equation obtained by equating a physical quantity with its Dimensional Formula is called a Dimensional equation. It is written by enclosing the symbols for base quantities with appropriate power in square brackets i.e ( ). The Dimensional Formula of any physical quantity is that expression that represents how and which of the base quantities are included in that quantity. That's why just subtracting one isn't a reliable way to tell if the phone is accelerating.Dimensions of the physical quantity are the power to which the base quantities are raised to represent that quantity. So it's possible to be accelerating the phone and still have the total acceleration come out as $g$ ($g$ = -1 in the phone's units). Which is the same as when the phone is stationary. $$ a_^2 = g^2 4g^2 \space cos^2\theta \left( sin^2\theta cos^2\theta - 1\right) $$Īnd because $sin^2\theta cos^2\theta = 1$ the quantity in the brackets is zero so you end up with:
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