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CBSE Class 12-science Answered

An electron moving horizontally with a velocity of 4 x 10^4  enters a region of uniform magnetic field of 10^-5T , acting vertically downwards as shown in figure. Draw its trajectory and find out the time it takes to come out of the region of magnetic field.
Asked by sanjanaprabha9 | 18 Jul, 2020, 12:54: AM
answered-by-expert Expert Answer
A s space t h e space e l e c t r o n space i s space m o v i n g space p e r p e n d i c u l a r space t o space t h e space m a g n e t i c space f i e l d comma space t h e r e f o r e space i t space w i l l space p e r f o r m space a space c i r c u l a r space m o t i o n. R a d i u s space i s space g i v e n space b y r equals fraction numerator m v over denominator B q end fraction r equals fraction numerator 9.1 cross times 10 to the power of negative 31 end exponent cross times 4 cross times 10 to the power of 4 over denominator 10 to the power of negative 5 end exponent cross times 1.6 cross times 10 to the power of negative 19 end exponent end fractionT i m e equals fraction numerator D i s tan c e space c o v e r e d space over denominator V e l o c i t y end fraction I f space i t space c o m p l e t e s space t h e space s e m i space c i r c l e space t h e n T equals fraction numerator pi r over denominator V end fraction O n space s u b s t i t u t i n g space t h e space v a l u e s space w e space c a n space g e t space t h e space t i m e space t a k e n space b y space t h e space e l e c t r o n.
Answered by Utkarsh Lokhande | 18 Jul, 2020, 12:39: PM

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CBSE 12-science - Physics
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CBSE 12-science - Physics
if breakdown voltage of each capacitor is 40v ,then maximum applied voltage Vmax will be
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explain
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
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