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एक एल्क्ट्रोन एक समान चुंबकीय क्षेत्र B म क्षेत्र के लंबवत v वेग से गमन करता है। अचानक चुंबकीय क्षेत्र घटकर B/2 रह जाता है। पथ की प्रारभिंक त्रिज्या र

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एक एल्क्ट्रोन एक समान चुंबकीय क्षेत्र B म क्षेत्र के लंबवत v वेग से गमन करता है। अचानक चुंबकीय क्षेत्र घटकर B/2 रह जाता है। पथ की प्रारभिंक त्रिज्या र का मान हो जायेगा :
A. घटकर r/2
B. बढाकर 2r
C. बढाकर 4r
D. घटकर r/4
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Correct Answer - B
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