HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q3 Solution: A long, straight wire carries a current along the -axis, One…

QPage 249: Q3: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q3 Solution: A long, straight wire carries a current along the -axis, One…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that two points symmetric about the wire have identical magnetic‑field vectors; however, while the magnitude $B=\frac{\mu_0 I}{2\pi r}$ is the same for equal radial distances, the direction follows the right‑hand rule and is opposite on opposite sides of the wire. Remember to treat $\mathbf B$ as a vector, not just a scalar magnitude.

A long, straight wire carries a current along the

z

-axis, One can find two points in the

x - y

plane such that

Multiple Choice Options

A the magnetic fields are equal
B the directions of the magnetic fields are the same
C the magnitudes of the magnetic fields are equal
D the field at one point is opposite to that at the other point.

Step-by-Step Verified Solution

**Answer:** (b), (c). **Step-by-Step Explanation:** In the x-y plane, points symmetric about the wire have equal magnitudes (c) but opposite directions (b is correct for points on opposite sides).

QPage 249: Q3: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q3 Solution: A long, straight wire carries a current along the -axis, One…

Multiple Choice Options

Step-by-Step Verified Solution

All Questions in this Chapter

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