Rob asked in Science & MathematicsPhysics · 1 decade ago

A certain sample carries a current of 4 A when the potential difference is 2 V and a current of 10 A when...?

the potential differences is 4 V. This sample:

A) obeys Ohms law

B) has a resistance of 0.5 ohms at 1 V

C) has a resistance of 2.5 ohms at 2 V

D) has a resistance of 25 ohms at 2 V

E) does not have a resistance

please explain

2 Answers

  • 1 decade ago
    Favourite answer

    According to ohm's law the current in the resistance increases linearly with the voltage. i.e.

    V = IR.

    Let us assume the sample in the question is a resistance, then following should hold true

    V1 / I1 = V2 / I2

    but in the given case (2/4 = 4/10) does not hold true. Therefore the sample in question does not obey the Ohms law and definitelty can't be a resistance.

    So the answer is "E"

  • trimpe
    Lv 4
    4 years ago

    if the textile is a ohmic conductor, is ought to Ohm's regulation, such that for it its resistance R ought to continually be consistent given by using R = V / I, yet right here this is no longer so. for this reason this is no longer ohmic in nature. as its resistance is R = 2/4 = 0. 5 ohm and R = 4 / 10 = 0.4 ohm, it may be non-ohmic and very own diverse resistance values decrease than diverse circumstances. of direction none of your thoughts journey this. seem into your question!!!.

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