Human eye is spherical in shape with a slight bulge at the front. Sclera: The outer part of eye is called sclera. It is white in colour with fibrous layer. The transparent part of it at the front of the outer side of the eye is called cornea. Light enters the eye through it. Its refractive index is […]
Friction due to relative velocity: A block A of mass M is placed on horizontal table. Another block B of mass m is places on block A as shown in figure. Now v1 and v2 (v1 < v2) are the velocities of A and B respectively. The conditions are explained below.1.  The coefficient of static
A block A of mass M is placed on horizontal table. Another block B of mass m is places on block A as shown in figure. Now F force is applied on A. The conditions are explained below. 1. If there is no friction between A and B and between A and table, then A
A block A of mass M is placed on horizontal table. Another block B of mass m is places on block A as shown in figure. Now F force is applied on B. The conditions are explained below. 1. If there is no friction between A and B and between A and table, then B
Friction related concepts: 1. A car of mass m is moving with speed u and brake is applied so that it travels distance s before stop. Find frictional force and coefficient of friction between the wheel and the road. Using the equation v2 = u2 + 2as we get, 0 = u2 – 2as or,
Friction: Friction is the retarding force which acts tangentially to the contact surface when a body actually moves or tends to move over the surface of another body. Static friction: The force of friction which exactly counter-balance the applied force during the stationary state of a body is called static friction. So static friction is
1. Capacitors in series: Let us consider three capacitors C1, C2 and C3 respectively are connected in series in between points AB, BC, CD with a cell as shown in figure. The potential difference between points AB, BC, CD are respectively (VAÂ – VB), (VB-VC) and (VC-VD). Q is the charge flows through the circuit.
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Energy stored in a capacitor: Let us consider initially the plates of a capacitor are uncharged and small positive charges are repeatedly transferred from one plate to the other plate. Let at any instant q be the total quantity of charge transferred and v be the potential difference between the plates. Then, q = Cv
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Capacitance of a spherical capacitor (outer sphere is earthed): Let us consider A and B are the two concentric spherical shells of radii a and b respectively (b >a). Shell A is charged by Q and the outer surface of shell B is earthed. So –Q charge is induced in the inner surface of B.
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Capacitance: If the charge of a conductor is increased then the potential of the conductor is also increased. Thus, charge (Q)  potential (V) or, Q = CV ——–(1) where C is the capacitance of the conductor and that conductor is called capacitor. From equation (1) C = ——-(2) so, the capacitance of the conductor is
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