एक बिंदु आवेश Q डिस्क के तल से दूरी b पर त्रिज्या R के एक डिस्क पर स्थित है, जैसा नीचे दी गयी आकृति में दर्शाया गया है। यदि आवेश से विद्युत अभिवाह का भाग डिस्क से होकर गुजरता है, तो R का मान ज्ञात कीजिए।

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AAI ATC Junior Executive 25 March 2021 Official Paper (Shift 1)
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संकल्पना:

हम जानते हैं कि एक खंड से होकर गुजरने वाले अभिवाह को निम्न द्वारा ज्ञात किया गया है जो वृत्त के केंद्र पर कोण θ बनाता है:

जहाँ 

गणना:

दिया गया है यदि अभिवाह का 1/4वां भाग डिस्क से होकर गुजरता है।

अब

⇒ (1- cosθ) = 1/2

⇒ cosθ =  = 

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