Patterns of problems
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Electric Charges And Fields

- Get the best out of this chapter by practicing the kind of problems asked in various Exams!
Pattern:Electrostatic force between charged particles
Description: When two or more than two charged particles are kept closely then they will experience force. This Force can be calculated by applying the coulomb's law. In some arrangements of these charged particles, a point may exist where the net force would be zero. Question can be asked: Calculation of force on charged particles in different mediums, Finding the location of neutral point, Question-related to equilibrium, Question-based on superposition principle.
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Pattern: Question based on dipole,
Description: It is an arrangement of two equal and opposite charges at a very small distance.
Questions may ask: Calculation of electric field due to a dipole, Calculation of dipole moment, torques, and Force on a dipole in the electric field.
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Pattern: Effect on motion of a charged particle in an electric field
Description: Electrostatic force can change position, velocity, acceleration of charged particles. Question-based on it can be solved by applying basic law of kinematics.
Question can be asked: Calculation of deflection of projected charged particle, Question can be ask related to conservation of energy, Calculation of time period of charge particle between two opposite charged particles.
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Pattern: Electric force/ field due to uniformly distributed charge using integration
Description: Coulomb's law is only applicable for a point-charged particle. But in many questions, charge is uniformly or non-uniformly distributed in entire volume or on surface of 2 or 3 D objects. In such cases, we assume that object is consist of large number of small-small particle and every small particle contain small charge called 'dQ'.We calculate the effect of that small element and then integrate over it to get the whole effect.
Question can ask to calculate: Electric field inside and outside uniformly charged Hollow or solid conductor or nonconductor sphere/ cylinder, Electric field due to charge rod, sheet, or plate, Electric field due to charged spherical ball having cavity.
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Pattern: Application of Gauss law
Description: Gauss law gives the relation between charge, flux, and electric field. In this method, electric flux through a gaussian surface act as a bridge between charge and electric field. Question may ask: Calculation of flux linkage through geometry, Calculation of charge contain in geometry with help of flux linkage, Calculation of electric field from symmetrical charged object.
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Pattern: Graphical based question
Description: Some questions may come which are based on the graph. eg: Comparison of Electric field strength at different points according to density f field lines, Distribution of charge in non-standard geometry.
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