Patterns of problems
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Moving Charges And Magnetism

- Get the best out of this chapter by practicing the kind of problems asked in various Exams!
Pattern: Determination of direction and magnitude of Lorentz Force
Description: When a charged particle enters a region consisting of magnetic force, it experiences a force. Lorentz force quantifies the force experienced by the charge. Questions based on Lorentz force are routinely asked in the short answer type questions.
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Pattern: Describing of the path of a moving charge in a Magnetic Field
Description: Lorentz Force is the force experienced by a charge when moving through a region consisting of both magnetic and electric field. The trajectory of motion depends on the initial direction of motion of particle before entering the region of the field. Questions based on determining the trajectory of motion using Lorentz are commonly asked in the exam.
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Pattern: Conversion of Galvanometer to Ammeter/Voltmeter
Description: Depending on how a shunt resistance is connected to a moving coil galvanometer, it can be used within a circuit as an ammeter or a voltmeter. Numerical problems based on determining the correct shunt resistance to be used with galvanometer can be asked in HOTS questions, So do pay extra attention.
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Pattern: Determination of force between different configurations of current-carrying wires
Description: We have learnt that there exists a magnetic field due to a conductor carrying a current which obeys the Biot-Savart law. An external magnetic field will exert a force on a current-carrying conductor, as expected from the Lorentz force expression. Thus, we can determine that two current-carrying conductors exert force on each other. Questions based on the force exerted between different configurations of straight conductors have been asked in exams.
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Pattern: Determination of magnetic field due to different configurations of current-carrying wires
Description: We know that a current carrying conductor has a magnetic field associated with it, the magnitude of which is quantified by the Biot Savart's Law. Using Biot-Savart's law we can determine magnitude of field around any current configuration.
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Pattern: Determination of torque on a current-carrying coil due to uniform/non uniform magnetic field
Description: We know that a rectangular loop carrying a steady current I and placed in a uniform magnetic field experiences a torque. It does not experience a net force. This behavior is analogous to that of electric dipole in a uniform electric field. Problems based on torque, net force experienced by a coil and its dipole moment are often asked in the exam.
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