PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › Electric Potential and CapacitanceOlympiadJEE Advanced
Created by StemPy LabAn uncharged capacitor of is being charged through a resistor by an ideal battery. At the moment the charging current has fallen to half its starting value, the battery is suddenly turned round, so that its terminals are reversed in the circuit. How much heat is produced in the resistor from that moment until the current has died away?
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← A student cannot read the internal resistance of a cell directly. She finds its null point on a potentiometer wire at 518 cm, and then at 370 cm after placing a 5.0 Ω load across it. What is the internal resistance?A point charge of +6.0 nC sits at one corner A of an imaginary cube with edges 10 cm long, in empty space. Three faces of the cube meet at A, and the other three do not touch it. The figure shades one of the faces that do not touch A. The cube is only a surface for counting flux: it holds nothing and changes nothing. There is no other charge anywhere near. Take ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻². What is the electric flux through the shaded face? →
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