International A LevelPhysicsEdexcelExam Questions2. Waves & ElectricityResistance, Resistivity & Potential Dividers

Resistance, Resistivity & Potential Dividers (Edexcel International A Level Physics)

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Resistance, Resistivity & Potential Dividers

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The equation I space equals space n q v A relates the current in a sample of a material to the movement of free charge carriers in the sample.

Which of the following is a correct definition of one of the terms in this equation?

  • n represents the number of charge carriers in the sample.

  • q represents the total charge stored in the sample.

  • v represents the drift velocity of the charge carriers in the sample.

  • A represents the surface area of the sample.

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A current-carrying wire AB of length x and uniform diameter is connected in a circuit as shown.

q8-wph12-02-oct-2021-edexcel-int-as-and-a-level-phy

The slider straight S is moved along the wire until the reading on the voltmeter is 0 V.

Which of the following equations is correct?

  • y over x equals R subscript 1 over R subscript 2

  • fraction numerator y over denominator x minus y end fraction equals R subscript 1 over R subscript 2

  • x over y equals R subscript 1 over R subscript 2

  • x over y equals fraction numerator R subscript 1 over denominator R subscript 1 plus R subscript 2 end fraction

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