Electromagnetic Induction | MCQs
سٹیپ اپ ٹرانسفارمر کیا کرتا ہے؟
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A. Has less turns in the secondary coil
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B. Has more turns in the primary
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C. Increases the input voltage
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D. Increases the input current
Explanation
A step-up transformer increases the voltage of the input signal, resulting in a higher voltage output.
This is achieved by having more turns in the secondary coil than in the primary coil.
ٹرانسفارمر کا موڑ کا تناسب 10 ہے۔ اس کا مطلب ہے ______؟
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A. Np - 10Ns
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B. Ns = 10 Np
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C. Vs = 10 Vp
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D. Is = 10 Ip
Explanation
A turn ratio of 10 means that the secondary coil (Ns) has 10 times more turns than the primary coil (Np).
This is a step-up transformer, which increases the voltage and decreases the current.
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A. Charge
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B. Mass
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C. Momentum
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D. Energy
Explanation
The direction of induced e.m.f. (electromotive force) in a circuit is determined by Lenz's law.
It states that the induced e.m.f. will oppose the change in magnetic flux that induced it.
This is a consequence of the conservation of energy.
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