Verified Solution • 2025–26 Session moderate

QPages 248-249: Q11: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Pages 248-249: Q11 Solution: Two parallel, long wires carry currents and with . When the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often forget that magnetic fields from parallel currents in the same direction oppose each other at the midpoint, while reversed currents reinforce them. Always apply the right-hand rule to determine vector direction before adding or subtracting the magnitudes.

Two parallel, long wires carry currents i1i_1 and i2i_2 with i1>i2i_1 > i_2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10 �T. If the direction of i2i_2 is reversed, the field becomes 30 �T. The ratio i1/i2i_1/i_2 is

Multiple Choice Options

  • A 4
  • B 3
  • C 2
  • D 1

Step-by-Step Verified Solution

**Answer:** (c) 2. **Step-by-Step Explanation:** When currents are in same direction: B_ = __(i_-i_)/(2�d) = 10 _T. When i_ is reversed: B_ = __(i_+i_)/(2�d) = 30 _T. Dividing: (i_+i_)/(i_-i_) = 3, giving i_/i_ = 2.

All Questions in this Chapter

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