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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Jul 2008 21:17:17 IST
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The acceleration of the particle was found to be ti+7j. Find t.
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6 Jul 2008 20:44:58 IST
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does no one know?
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7 Jul 2008 23:40:59 IST
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Simple.
Accln is along force ( magnetic ) F.
F is perpendicular to both v and B. [ F = q ( V X B ) ]
so Accln a is perpendicular to B.
so a.B = 0
( ti+7j.) . ( (7i-3j)x10 ^-3 ) = 0
( t i + 7 j ) . ( 7 i - 3 j ) = 0
7 t - 21 = 0
hence t = 3
Rate me if it helps.
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it is not important where u stand, but in which direction u are moving |
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8 Jul 2008 22:00:56 IST
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yes i got your point but the answer is -3.
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8 Jul 2008 22:23:36 IST
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No, the answer cant be = -3.
It is +3.
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8 Jul 2008 22:25:38 IST
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yeah the answer cant be -3!!
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B.TECH ECE
NIT ALLAHABAD |
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9 Jul 2008 11:34:24 IST
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@ juana
what are u saying man.....how can time taken be negative
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9 Jul 2008 12:24:43 IST
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@paddy.dude,
The 't' in the question doesnt denote time. 't' is a variable having units of acceleration.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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Posts:
Can marks really judge a student??
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9 Jul 2008 21:13:32 IST
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hey t is an arbitary variable; it does not denote time here.
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9 Jul 2008 21:38:31 IST
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sorry my mistake
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9 Jul 2008 21:54:02 IST
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in the ques it shud b ti-7j to get t=-3.....
or evn in the magnetic field it shud b 7i+3j
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