EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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0.5 A
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2 A
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4 A
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8 A
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Detailed explanation-1: -The new current I’ will be given as: The resulting current will be 8 A when resistance in the circuit decreases to one-fourth of its original amount while the voltage kept constant.
Detailed explanation-2: -Hence, at a constant voltage, decreasing resistance will result in an increased current.
Detailed explanation-3: -How does resistance affect current? Current is inversely proportional to resistance, expressed as I∝1R I ∝ 1 R . This means that as the resistance increases, current decreases, and if the resistance decreases, current increases.
Detailed explanation-4: -If resistance decreases the voltage also decreases.
Detailed explanation-5: -According to question, Resistance (R) is halved. Now, if the resistance is halved and the voltage remains the same, the new value of current becomes, I′ = 2V/R, I′ = 2(V/R) = 2I. Hence, the current will become double.