Electrician and Wireman Electronic Devices and Circuits Basic Electronics

खालीलपैकी कोणत्या सामग्रीमध्ये ऋणात्मक तापमान गुणांक आहे?

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पितळ
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पारा
3
विद्युत अपघटनी
4
चांदी
5
तांबे

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