Help please.. mod 4 (1 Viewer)

[sarbear.h]

how are you meant to do this question:
the answer is-
a) A
b) B
c) G

 

[liamkk112]

how are you meant to do this question:
the answer is-
a) A
b) B
c) G
View attachment 43589

use right hand rule, for the first one you can pretty much ignore the wire on the right, then you’ll see that at P your fingers are pointing upwards indicating A
similar idea for the rest

 

[sarbear.h]

use right hand rule, for the first one you can pretty much ignore the wire on the right, then you’ll see that at P your fingers are pointing upwards indicating A
similar idea for the rest

which way am i supposed to point my thumb because for me it keeps going right. what’s the difference between point P and R

 

[liamkk112]

which way am i supposed to point my thumb because for me it keeps going right. what’s the difference between point P and R

for finding magnetic field produced by a current carrying conductor, using your right hand point your thumb in the direction of current, and curl your fingers kinda like a thumbs up; the direction your fingers curl is the direction of the B field.

point R is in between both the conductors, so it will be affected by B fields produced by each conductor; because it’s equidistant from each of the two wires, the B fields cancel out (this can be seen via right hand rule, one B field is pointing down, the other up)

point P is sufficiently far from the conductor on the right, so we can choose to ignore it (we can assume the B field produced by the conductor on the right will have minimal effect there); then we only have to consider the B field produced by the conductor on the left, and the right hand rule produces the result