FST 6
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TEST SERIES (PHYSICS FST)

266456 An elementary particle of mass \(m\) and charge \(+e\) is projected with velocity \(v\) towards a much more massive particle of charge \(Z\), where \(Z>0\). What is the closest possible distance of approach of the incident particle?

1 \(\frac{\mathrm{Ze}^2}{2 \pi \varepsilon_0 n v^2}\)
2 \(\frac{\mathrm{Ze}}{4 \pi \varepsilon_0 m v^2}\)
3 \(\frac{\mathrm{Ze}^2}{8 \pi \varepsilon_0 m v^2}\)
4 \(\frac{\mathrm{Ze}}{8 \pi \varepsilon_0 m v^2}\)
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TEST SERIES (PHYSICS FST)

266457 Assertion: Electrons in the atom are held due to coulomb forces. Reason: The atom is stable only because the centripetal force due to Coulomb's law is balanced by the centrifugal force. h above question a statement of assertion is followed by statement of reas on mark the correct choice.

1 It both assertion and reason arc true and reason is correct explanation of assertion.
2 It both assertion and reason arc true and reason is correct explanation of assertion is not
3 assertion is true but reason is false.
4 Both assertion and reason false. \(=15, \mathrm{Na}=23, \mathrm{Mg}=24, \mathrm{P}=31, \mathrm{~S}=32, \mathrm{Cl}=35.5\), \(\mathrm{s}=108\), \(\mathrm{I}=127, \mathrm{Ba}=137, \mathrm{Au}=197, \mathrm{~Pb}=207\) SECTION-A Attempt All 35 Questions
**NCERT-XII-II-11**
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TEST SERIES (PHYSICS FST)

266456 An elementary particle of mass \(m\) and charge \(+e\) is projected with velocity \(v\) towards a much more massive particle of charge \(Z\), where \(Z>0\). What is the closest possible distance of approach of the incident particle?

1 \(\frac{\mathrm{Ze}^2}{2 \pi \varepsilon_0 n v^2}\)
2 \(\frac{\mathrm{Ze}}{4 \pi \varepsilon_0 m v^2}\)
3 \(\frac{\mathrm{Ze}^2}{8 \pi \varepsilon_0 m v^2}\)
4 \(\frac{\mathrm{Ze}}{8 \pi \varepsilon_0 m v^2}\)
**NLI Expert**
TEST SERIES (PHYSICS FST)

266457 Assertion: Electrons in the atom are held due to coulomb forces. Reason: The atom is stable only because the centripetal force due to Coulomb's law is balanced by the centrifugal force. h above question a statement of assertion is followed by statement of reas on mark the correct choice.

1 It both assertion and reason arc true and reason is correct explanation of assertion.
2 It both assertion and reason arc true and reason is correct explanation of assertion is not
3 assertion is true but reason is false.
4 Both assertion and reason false. \(=15, \mathrm{Na}=23, \mathrm{Mg}=24, \mathrm{P}=31, \mathrm{~S}=32, \mathrm{Cl}=35.5\), \(\mathrm{s}=108\), \(\mathrm{I}=127, \mathrm{Ba}=137, \mathrm{Au}=197, \mathrm{~Pb}=207\) SECTION-A Attempt All 35 Questions
**NCERT-XII-II-11**
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