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Electricity and, , Magnetism, , , , , , , , , ulomb's inverse square law, Electric field,, otential and potential difference. Magnetic, its units, magnetic lines of, , , , , , , , , Concept of charge, Co, Electric field intensity, P', , field and magnetic field intensity and, Electric current, Ohm's law, specific, , force, magnetic flux., arallel combination of resistance,, , resistance, laws of series and p, heating effecting of electric current., , Unit Outcomes, , 1. Calculate electric field potential and potential difference of the, given static charge., , 2. Describe the concept of given magnetic intensity, Televant units., , 3. Explain the heating effect of the given electric current., arallel combination in the given electric, , and flux with, , 4. Apply laws of series and p', circuits,, , 24 Concept of Charge, , , , C . ‘ ont, harge is the fundamental quantity of electricity. It is the property, , aSsocial s : :, ted with matter due to which it produces and experiences, , , , , , @2-D, , , , Scanned with CamScanner
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Electricity and Magnetic,, , , , , , , Basic Science (Physics), , , , cess or deficiency of an, , i c eX, | electrical and magnetic effects. The, , i i ce., | electrons in a body gives the concept of charg, , ‘The property of particle which produces electrical influenc,, , around it is called as charge., i\ There are two types of electric charges :, i) positive charge (®) e.g. protons, ii) negative charge (©) e.g. electrons., The total charge of the system remains constant., , f i SI Unit of Charge coulomb (C), , ¢ Force between two charges, m i) © ©, Two positive charges repel each other., ii) © ©, Two positive charges repel each other., iii) ® ©, Positive and negative charges attracts each other., , iv) Two equal number of positive and ne, , ative charge i, electrically neutral., , From (i) to (iii), like charges repel each other, , and unlike chargé”, attract each other. ‘, , The protons and electrons create electric fie, , Ids which exerts a fort, called Coulomb’s force. oe, , 2.2 | Coulomb's Inverse Square Law, , Statement :, at rest is, , ‘ PO, , ™, chnical Publications — an y, P thrust for kn, lowledge, , The force of attraction or Tepulsion between two charg®, , Scanned with CamScanner
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Rave Science (Physics) 2-3 Electricity and Magnetism, i) Directly proportional to the product of the magnitude of two, , harges and, , char, , it) Inversely proportional to the square of distance between them., , Explanation :, , Fig. 2.2.1, Consider the two point charges q, and q, are separated by a, , Gistance *r’. The force between these two charges is given by, , Fa ie, T, F=K-2, T, Where K = Constant, oy PL, 4re- 4re,k, , Where, € =e k= Permittivity of medium, €, = Permittivity of vacuum of free space or air, , € “ ., k= = = Dielectric constant., 0, , [_, 1 q, F=— i, 4re,k, |, , 2, isy, , “4, , , , , , , , T Technica nm, Schnical Publications —An up thrust for knowledge, , a, , Scanned with CamScanner
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Electricity and Magnetism,, , , , , , Basic Science (Physics) 2-4, But,, \ 99 22, = 9x10 Nm/C, 4ne,K, 9 4,95, F= 9x10 re, , , , , , , , 2.2.1 Factors affecting on Force between Two Electric, , Charges, , The factors affecting on force between two electric charges are, , i) Charge, ii) Distance between two charges, , iii) Dielectric constant of the medium, , iv) Permittivity of the medium., , Note :, , 1) Dielectric : The substances which does not allows Current to, flow through them but shows electrical effects are called, dielectric, (e.g. Insulators like glass, wood, paper etc.), , 2) Permittivity : The ability or property of dielectric Medium to, permit electric tides of force to pass through it, is called as, permittivity of medium. ;, , 3) k=1, for air, , 4) k>1, for other medium, , 5) k =e, for metal., , , , 2.2.2. One coulomb (Unit Charge), We know that,, , [s), , F=9 x 19? 41%, kr, , , , 5 ™, 7 Technical Publications ~ AN UD three, , Scanned with CamScanner
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=__~_—Ss=ss—a—sFees—Fseeh, Basic Science (Physics) 2-5 Electricity and Magnetism, If, q, =4,=1C, k=1, r=l1m, then, F=9x10'N, , Definition : One coulomb charge is that charge which when placed in, yacuum or air at a distance of 1 m from an equal and similar charge,, experiences a repulsive force of 9 x 10’N., , OR, , If two equal and similar charges are separated by 1 m apart and, exerts a force of 9 x 10’N, then each charge is said to be 1 coulomb., , Q.1 State Coulomb's law., , Q.2 State Coulomb's inverse square law of electrostatics., , Q.3 State and explain Coulomb's inverse square law of electrostatics., C= MSBTE : Summer 2011, 2012, Winter 2011, 2012, Marks 4, , Q.4 Define Coulomb., , Q.5 Define one Coulomb., , Q.6 Define unit charge., , , , Example 2.2.1 : Calculate the force of repulsion between two unit charges, placed unit distance apart in air., , t2 MSBTE : Summer 2005, Winter 2005, Winter 2006, Marks 2, , , , , , Solution: Given : g,=1C, qg,=1C, r=Im, k = | forair, By formula, F=9x 10 Ue _9y LY, , dy, , F=9x10°N, , = ————, - ™ wv fledg, T Techmcal Publications An up thrust for io’ e, , , , , , EE —_, , Scanned with CamScanner, , , , —
