defence exam Navy SSR (Medical) Mock Test Series 2025 Physics Current, Resistance and Electricity Resistance and Resistivity

यदि प्रतिरोध R वाला एक तार पिघल जाता है और अपनी आधी लम्बाई खो देता है तो तार का नया प्रतिरोध क्या होगा?

1
R/4
2
R/2
3
R
4
2R
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