Multiple Choice Questions on When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circu........... for 10th Standard Preparation

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Multiple Choice Questions

When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circu...........

Physics Chapter - 12
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    When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister:

    5000 Ω

    Incorrect Answer

    800 Ω

    Incorrect Answer

    0.8 Ω

    Incorrect Answer

    none of these

    Correct Answer
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    Explanation:

    Given that,

    Voltage of the battery, V = 40 V

    Current in the unknown resistor, 

    Let R is the resistance of the resistor. It can be calculated using Ohm's law. it gives the relationship between the voltage, resistance and current.

    R = V / 1

    R = 40V / 10-1 A

    R = 400 ohms

    So, the value of the resistance of the resistor is 400 ohms.

    By: santosh
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