JEE Advanced 2020 Full Test 6 Paper 1

Question : 2 of 54

Marks: +1, -0

Consider a bob of mass m and having charge q attached with a light string of length I and pivoted at point O. It is released at rest at 60∘ with vertical. There are two regions- Region-I (left of line PQ ) has a uniform and constant magnetic field B directed inside plane of paper. Region-II (right of line PQ ) has a constant and uniform electric field E directed vertically up as shown. Consider no effect of gravity in both the regions.

Time taken by particle to cross region-I for 1‌st ‌ time is π√‌
2ml
5qE
Time taken by particle to cross region-I for 2‌nd ‌ time is π√‌
2ml
13qE
Angular speed of 1‌st ‌ revolution in magnetic field is √‌
5qE
2ml
Angular speed of 2‌nd ‌ revolution in magnetic field is √‌
13qE
ml

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