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CBSE Class 12-science Answered

What will be the answer for this question?
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Asked by dineshchem108 | 29 May, 2019, 11:12: PM
answered-by-expert Expert Answer
begin mathsize 14px style L e t space m a g n e t i c space f i e l d space v e c t o r space B with rightwards arrow on top space equals space a space i with hat on top space plus space b space j with hat on top space plus space c space k with hat on top space I f space v e l c o i t y space v e c t o r space v with rightwards arrow on top equals space 1 i with hat on top space comma space space t h e n space f o r c e space q open parentheses space v with rightwards arrow on top space cross times space B with rightwards arrow on top space close parentheses space space equals space q open vertical bar table row cell i with hat on top end cell cell j with hat on top end cell cell k with hat on top end cell row 1 0 0 row a b c end table close vertical bar space equals space q open parentheses negative c space j with hat on top space plus space b space k with hat on top space close parentheses space space.......... left parenthesis 1 right parenthesis end style 

But for thae above velocity vector, given force is  begin mathsize 14px style F with rightwards arrow on top space equals space q open parentheses negative 1 space j with hat on top space plus space 1 space k with hat on top space close parentheses end style ..................................(2)
Hence by comparing eqn.(1) and (2),   we get,   b = c = 1;
 
begin mathsize 14px style I f space v e l c o i t y space v e c t o r space v with rightwards arrow on top equals space 1 j with hat on top space comma space space t h e n space f o r c e space q open parentheses space v with rightwards arrow on top space cross times space B with rightwards arrow on top space close parentheses space space equals space q open vertical bar table row cell i with hat on top end cell cell j with hat on top end cell cell k with hat on top end cell row 0 1 0 row a b c end table close vertical bar space equals space q open parentheses c space i with hat on top space minus space a space k with hat on top space close parentheses space space.......... left parenthesis 3 right parenthesis end style
But for thae above velocity vector, given force is  begin mathsize 14px style F with rightwards arrow on top space equals space q open parentheses 1 space i with hat on top space minus space 1 space k with hat on top space close parentheses end style ..................................(4)
Hence by comparing eqn.(3) and (4), we get ,   c = a = 1 ;
 
Hence magnetic field vector is given by, begin mathsize 14px style B with rightwards arrow on top space equals space i with hat on top space plus space j with hat on top space plus space k with hat on top space end style
Answered by Thiyagarajan K | 30 May, 2019, 02:52: PM

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CBSE 12-science - Physics
solve option e
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Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
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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?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
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CBSE 12-science - Physics
which answer is correct and most appropriate with explanation
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Asked by mishrigupta19319 | 08 Apr, 2024, 06:28: PM
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CBSE 12-science - Physics
8212
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Asked by madhav9119887644 | 07 Apr, 2024, 08:10: PM
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CBSE 12-science - Physics
ans the questions wit reason
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Asked by mishrigupta19319 | 07 Apr, 2024, 11:23: AM
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CBSE 12-science - Physics
I don't know which concept and formula is used
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Asked by adityagalar2007 | 06 Apr, 2024, 01:06: PM
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CBSE 12-science - Physics
what is the mass of the bidy
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Asked by amlanmcob | 06 Apr, 2024, 12:27: PM
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CBSE 12-science - Physics
13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
Asked by hussain221man | 05 Apr, 2024, 08:44: PM
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CBSE 12-science - Physics
A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at
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Asked by mishrigupta19319 | 05 Apr, 2024, 12:01: PM
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CBSE 12-science - Physics
a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point
Asked by manishamunda787 | 02 Apr, 2024, 11:07: AM
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