Concepts on electrostatic potential: 1. Electrostatic potential at a point on the axis of a uniformly charged ring: Let us consider a ring of radius R is uniformly charged by q. To calculate electrostatic potential at a point P on the axis of ring at a distance y from the centre O, we consider an […]
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Force per unit area of a charged conductor: Let us consider the electric field E at any point P very near, but outside, the surface of a charged conductor is E = E1 + E2. Where E1 is the field due to the charge of small area ds around P, and E2 due to the
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Solid angle: The projection of a area divided by r2 (position vector) is called solid angle. The solid angle subtended by an area at a point O is given by Ω = . Where  is the projection of area. For sphere the solid angle subtended at the centre is Ω =  =  = =
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5. Oscillation of a charge: Two +q charge particles are placed at point A (0, a) and B (0, -a) on the Y axis and another charge particle –Q is released from rest at point C (b,0) on the X axis. At any instant -Q is at point D of distance x from origin. *(i)
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1. Concept of electrostatic force: 1. Force on a point charge due to uniformly charged rod: A rod of length L is uniformly charged by Q placed at a distance D from a point charge q at P. Charge per unit length of the rod is λ = . We consider an elementary part of
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Newton’s equation:Let us consider an object AB is placed at a distance u from the pole of a concave mirror of focal length f. The image A/B/ is formed at a distance of v from the pole. Let us consider the distance between object and focus is FA = x = (u – f) and distance
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Some basic numericals based on mirror formula are given in the blog of ‘Reflection through curved surface class – X‘. To get the numericals click the given button. Click here More concepts for the preparation of competitive examinations are given below. 1. A rod of length l lies along the principal axis of a concave
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Reflection through spherical surface: The basic definition of centre of curvature, radius of curvature, pole, aperture, principle axis, principle focus, focal plane, focal length etc. are explained in the blog of ‘Reflection through curved surface class – X‘. To get the informations click the given button. Click here Sign convention for reflection by spherical mirror:
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Relation between object and image velocity: 1. When object is moving along the principal axis: Let us consider, a point object is moving along the principal axis of a concave mirror of focal length f. At any instant the object distance is u and image distance is v. Using mirror formula we get, Â ——-
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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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