दो शहरों के बीच की दूरी 425 किमी० है । दो कारें दोनों शहरों से एक साथ चलती है एक कार की चाल दूसरी कार की चाल से 5 किमी / घण्टा अधिक है । यदि दोनों कारों के बीच की दूरी 3 घण्टे बाद 20 किमी० हो तो दोनों कारों की चाल ज्ञात कीजिए ।
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Answer:
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... An electromagnet works because an electric current produces a magnetic field.
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Step-by-step explanation:
first car is 65and second car is 70
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