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Class 12 Mcq

Class 12 Physics के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

PhysicsWhy does a metal rod held by hand fail to retain static charge when rubbed, while a plastic rod can retain it?Class 12Electric Charges and FieldsConductors and InsulatorsEasy PhysicsTreating an insulator as equipotential like a conductor is based on which wrong assumption?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsIf charge is localized on an insulator, what type of electric-field distribution is likely near it?Class 12Electric Charges and FieldsConductors and InsulatorsEasy PhysicsA rubbed insulator does not spread charge over its whole surface. What is the deeper reason?Class 12Electric Charges and FieldsConductors and InsulatorsEasy PhysicsHow can induction in a conductor and polarisation in an insulator be distinguished at the microscopic level?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy can attraction occur in an insulator due to polarisation even if its net charge remains zero?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsA conductor is earthed. What does it mean that its potential becomes equal to Earth’s potential?Class 12Electric Charges and FieldsConductors and InsulatorsEasy PhysicsWhy can electrons go from an earthed conductor to earth near a negatively charged rod?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy can electrons move from Earth to an earthed conductor near a positively charged rod?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy must earthing be removed before the external object is removed during charging by induction?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy does the net charge remain unchanged when induction occurs in a neutral conductor without contact or earthing?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy does a negative effect appear at the far end of a neutral conductor when a negatively charged rod is brought near it?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy does a positive effect appear at the far end of a neutral conductor when a positively charged rod is brought near it?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy does the surface charge distribution change when an external charge is brought near an isolated conductor?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsCharge spreads uniformly on an isolated spherical conductor but not necessarily on an irregular conductor. What is the main reason?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy is ionisation of air more likely near a sharp conducting tip?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy does surface charge density vary over a conductor having regions with different curvatures?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsThe electric field just outside a conductor is perpendicular to its surface. Which conclusion follows from this fact?Class 12Electric Charges and FieldsConductors and InsulatorsMedium PhysicsWhy must the component of electric field parallel to a conductor surface be zero in electrostatic equilibrium?Class 12Electric Charges and FieldsConductors and InsulatorsHard PhysicsIf the electric field inside a conductor is zero is it impossible to have electric field outside it?Class 12Electric Charges and FieldsConductors and InsulatorsMedium