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Vectors 411<br />
=<br />
<br />
i j k<br />
<br />
x y z<br />
x y z<br />
2 2 2 3/2 2 2 2 3/2 2 2 2 3/2<br />
( x y z ) ( x y z ) ( x y z )<br />
3 2yz<br />
3 2yz<br />
<br />
2 ( x y z ) 2 ( x y z )<br />
<br />
= i<br />
<br />
2 2 2 5/2 2 2 2 5/2<br />
= 0<br />
Hence, F is irrotational.<br />
F = , where is called scalar potential<br />
d = dx <br />
dy <br />
dz<br />
x y z<br />
<br />
= i j k .( i dx jdy kdz)<br />
x y z<br />
<br />
<br />
xi yj<br />
zk<br />
= .( <br />
idx jdy kdz )<br />
2 2 2 3/2<br />
( x y z )<br />
1 2xdx 2y dy 2zdz<br />
=<br />
2 2 2 3/2<br />
2<br />
<br />
( x y z )<br />
=<br />
Now, Div F <br />
= .F<br />
=<br />
3 2xz<br />
3<br />
2xz<br />
j <br />
<br />
2 <br />
( x y z ) 2 <br />
( x y z )<br />
3 2xy<br />
3<br />
2xy<br />
k <br />
2 <br />
( x y z ) 2 <br />
( x y z )<br />
1<br />
<br />
2 2 2 2<br />
<br />
<br />
<br />
2 2 2 5/2 2 2 2 5/2<br />
2 2 2 5/2 2 2 2 5/2<br />
<br />
<br />
<br />
<br />
<br />
<br />
[Total differential coefficient]<br />
<br />
= . dr Fdr .<br />
xdx y dy zdz<br />
= 2 2 2 3/2<br />
( x y z )<br />
1<br />
2<br />
1 1<br />
( x y z ) <br />
1<br />
2<br />
1 <br />
| r |<br />
2 2 2<br />
( x y z ) 2<br />
<br />
xi yj<br />
zk<br />
= i j k . (<br />
2 2 2 )<br />
3/2<br />
x y z<br />
x y z<br />
x y z<br />
<br />
<br />
x ( x y z ) y ( x y z ) z<br />
( x y z )<br />
2 2 2 3/2 3<br />
2 2 2 1/2<br />
( x y z ) (1) x<br />
( x y z ) (2 x)<br />
2<br />
<br />
2 2 2 3<br />
( x y z )<br />
=<br />
2 2 2 3/2 2 2 2 3/2 2 2 2 3/2<br />
Ans.<br />
2 2 2 3/2 3<br />
2 2 2 1/2<br />
( x y z ) (1) y<br />
( x y z ) (2 y)<br />
<br />
2<br />
<br />
2 2 2 3<br />
( x y z )<br />
2 2 2 3/2 3<br />
2 2 2 1/2<br />
( x y z ) (1) z<br />
( x y z ) (2 z)<br />
<br />
2<br />
<br />
2 2 2 3<br />
( x y z )