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The directional derivative of 1/r in the direction of 
is
is- a)1/r2
- b)-1/r2
- c)1/r3
- d)-
/r3
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The directional derivative of 1/r in the direction ofisa)1/r2b)-1/r2c)...
Concept:
Let f(r) be a function then directional derivative of the function f(r) is given by:
Calculation:
Given:
f(r) = 1/r
As we know that, if f(r) is a function then directional derivative of the function f(r)is given by:
f(r) = 1/r
∵ 
Here, we have to find the directional derivative of f(r) in the direction of 
. It will be given by:
. It will be given by:
Most Upvoted Answer
The directional derivative of 1/r in the direction ofisa)1/r2b)-1/r2c)...
Concept:
Let f(r) be a function then directional derivative of the function f(r) is given by:
Calculation:
Given:
f(r) = 1/r
As we know that, if f(r) is a function then directional derivative of the function f(r)is given by:
f(r) = 1/r
∵
Here, we have to find the directional derivative of f(r) in the direction of . It will be given by:
. It will be given by:Attention Civil Engineering (CE) Students!
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The directional derivative of 1/r in the direction ofisa)1/r2b)-1/r2c)1/r3d)-/r3Correct answer is option 'B'. Can you explain this answer?
Question Description
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