PhysicsHardHigh School (11–12)Electricity & Magnetism › Electric Potential and CapacitanceNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabFive statements about capacitors are given below. (i) The capacitance of a parallel-plate capacitor is unchanged if the charge on its plates is doubled. (ii) Capacitors joined in parallel carry equal charges. (iii) Two charged capacitors joined with like plates together lose no energy if their potential differences were equal. (iv) A capacitor on a battery stores less energy when a dielectric slab is slid in. (v) An isolated charged capacitor stores more energy when a dielectric slab is slid in. How many of the statements above are correct?
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← The figure shows three equipotential circles of an isolated point source in vacuum, with the potential zero very far away. (i) The magnitude of the field at A is four times that at B. (ii) The field does no work on a +1.0 µC charge taken from B to C. (iii) An agent must do 60 µJ to take a +2.0 µC charge slowly from D to A. (iv) The source carries a negative charge. (v) The magnitude of the field at A is 90 V cm⁻¹. How many of the statements above are correct?Four long straight wires pass through the corners A, B, C and D of a square, perpendicular to the page, as in the figure. Each carries the same current I: out of the page in A and B, into the page in C and D. A fifth long straight wire passes through the centre O of the square and carries a current I out of the page. Only the four other wires act on the fifth. In which direction is the force on the fifth wire? →
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