PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › ElectrostaticsNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabA teacher cuts a spherical cavity inside a solid metal sphere that stands alone, far from other bodies, and carries no net charge. She then hangs a point charge inside the cavity, away from its centre, on an insulating thread, so that it touches nothing. After the charges in the metal have settled, which statement is correct?
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← Five statements about electric charge are given below. Take e = 1.6 × 10⁻¹⁹ C. (i) A body can carry 4.8 × 10⁻¹⁹ C of charge. (ii) A charged rod attracts paper pieces because they gain a net opposite charge. (iii) In a medium of dielectric constant K, the force between charges is K times that in vacuum. (iv) The force between two point charges, found from Coulomb's law, is not changed by bringing a third charge near them. (v) Two neutral bodies rubbed together acquire equal and opposite charges. How many of the statements above are correct?The figure shows a parallel-plate capacitor with plates of area A a distance d apart. It was charged to a charge Q and then disconnected from its battery. A slab of dielectric constant 4, as large as the plates and of thickness d/2, now lies against the lower plate, and the upper half of the gap is empty. How does the energy stored in the capacitor compare with its value before the slab was put in? →
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