Physics · Electrical Engineering Principles
यदि किसी ओवरहेड पावर ट्रांसमिशन लाइन सिस्टम की परिचालन आवृत्ति (frequency) को 60 Hz से बदलकर 50 Hz कर दिया जाता है, तो इंसुलेटर स्ट्रिंग की स्ट्रिंग दक्षता (string efficiency):
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