A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear.
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A wire of length L and crosssectional area A has a resistivity ρ. Which of the following formulas can be used to calculate the resistance of the wire?
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The electric current as a function of voltage of a wire is presented by the attached graph.What is the resistance of the wire?
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An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?
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A battery of emf E and negligible internal resistance is connected to two resistances R1 and R2 in series. What the potential difference across R2 ?
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The electric current as a function of voltage of a wire is presented by the graph. What is the power dissipated in the resistor when the applied voltage is 5 V?
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Image formed by convex mirror for real object placed anywhere is ?
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Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?
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Two resistances 2Ω and 3Ω are in parallel. The combination is in series with 1.5Ω resistance and a power supply of voltage V. There is a current of 3A through the 2Ω resistance. What are the values of the current I delivered by, and the voltage V across the power supply?
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In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was I = kV n , where k and n are constants which may be obtained from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is
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