PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › Current ElectricityNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabAssertion (A): A student connects a variable resistor of resistance across a cell of fixed emf and internal resistance , and changes from zero to a very large value. The power dissipated in the resistor is greatest when . Reason (R): The current drawn from the cell is the largest when .
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← Assertion (A): A copper wire is joined to a source that keeps the electric field in the wire the same. The wire is then heated. The drift speed of its free electrons increases.
Reason (R): The relaxation time of the free electrons in a metal falls as the temperature rises, because the ions vibrate more strongly.A bulb marked 100 W, 220 V and a bulb marked 60 W, 220 V are joined in series. Take the resistance of each bulb as constant. Two statements are given below. Statement I: Across a 220 V supply, the 60 W bulb glows more brightly than the 100 W bulb. Statement II: Across a 440 V supply, the 100 W bulb is the first to receive more than its rated voltage. →
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