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सामन्य द्रव्यमान m के दो स्मरोपप कण जिन पर आवेश `+q` तथा `-q` है, d दुरी से पृथक है। ये चुंबकीय एकसमान चुंबकीय क्षेत्र `vecB`में जो कागज के तल लंबवत नीचे की ओर दिष्ट है, `v_(1)` तथा `v_(2)` चालों से चित्रानुसार प्रवेश करते है। ये कण परस्पर नहीं टकरायेंगे यदि :(स्थिरवैधुत बल के नगण्य लेते हुए)
image
A. `dgt(2m)/(Bq)(v_(1)+v_(2))`
B. `dlt(m)/(Bq)(v_(1)+v_(2))`
C. `dlt(2m)/(Bq)(v_(1)+v_(2))`
D. `v_(1)=v_(2)`

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Correct Answer - C
माना चुंबकीय क्षेत्र में कणों के वृत्तीय पथों की त्रिज्याएँ `r_(1)` व `r_(2)` है। कण नहीं टकरायेंगे यदि
`dgt2(r_(1)+r_(2))`
अथवा `dgt2((mv_(1))/(BQ)+(mv_(2))/(Bq))`
अथवा `dgt(2m)/(Bq)(v_(1)+v_(2))`

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