Test Index

NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 3
Total: 28
A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.
Solution:  
Let us first decide the standard directions on the plane of paper.

Magnitude of magnetic field
|
→
B
| =
µ0
4π
2I
r
 = 10−7×
2×50
2.5
 = 40 × 10−7 T
By right hand palm rule, the direction of magnetic field can be seen as upward.
→
B
 = 40 × 10−7
^
k
 T
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