The device used to increase or decrease AC voltage is MCQ with Answer and Explanation
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Question #1
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Two parallel wires carrying direct currents in the opposite directions will:
Correct Answer: Option D
Explanation:
According to Ampere's force law, parallel wires carrying currents in the SAME direction create magnetic fields that attract each other. Conversely, parallel wires carrying currents in OPPOSITE directions create magnetic fields that push against each other, causing the wires to repel. Exam tip: 'Same' Attracts, 'Opposite' Repels (reverse of charges!).
According to Ampere's force law, parallel wires carrying currents in the SAME direction create magnetic fields that attract each other. Conversely, parallel wires carrying currents in OPPOSITE directions create magnetic fields that push against each other, causing the wires to repel. Exam tip: 'Same' Attracts, 'Opposite' Repels (reverse of charges!).
Question #2
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A force of 20 N acts on a body of mass 4 kg for 5 s. Change in momentum is
Question #3
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Heat is a form of
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