Home/ Questions/Q 486435
In Process
Vatsal Mishra
  • 1
Poll
Asked: 2025-04-07T04:24:34+00:00 In:

Two unlike magnetic poles of strength 10 A-m each are held in air at a distance of O- IO m from each other. What is the magnetic force of attraction between them ?

  • 1

Poll Results

12.5%(A) 3 × 10⁻³ N ( 1 voter )
12.5%(B) 2.5 × 10⁻³ N ( 1 voter )
0%(C) 1.5 × 10⁻³ N
75%(D) 1 × 10⁻³ N ( 6 voters )
Based On 8 Votes

Participate in Poll, Choose Your Answer.

Answer: (D) 1 × 10⁻³ N.
The force of attraction between the unlike magnetic poles is
1×10⁻³ N. This is calculated using the formula involving permeability of free space, magnetic pole strengths and distance.

chapter 5 magnetism and matterclass 12thmcqphysics
Share

    1 Answer

    1. The magnetic force F between two magnetic poles is given by:
      F = μ0 ⋅m1 ⋅m2/4πr²
      Here,
      μ0 = 4π × 10⁻⁷ N/A² ,m = m = 10A\cdotpm,
      r = 0.1m.
      Substituting the values:
      F = 4π × 10⁻⁷ . 10 . 10/4π. (0.1)² = 10⁻⁵/0.01 = 1 × 10⁻³N
      Answer: (D) 1 × 10⁻³ N

      So, the magnetic force of attraction is
      1 × 10⁻³ N.

      • 11
    Leave an answer

    Leave an answer

    Browse