Question
A 2 amp current is flowing through two different small circular copper coils having radii ratio 1: 2. The ratio of their respective magnetic moments will be
NEET
Physics
Magnetic Effects of Current
2025
NEET 2025
NEET Physics Question (2025) — Solution
Options
- A. 1: 4
- B. 1: 2
- C. 2: 1
- D. 4: 1
Answer
A. 1: 4
Step-by-step solution
aligned & Magnetic moment M = I ( ~A )\\ & aligned & M = I ( r ^2 ) \\ & M _1 M _2 = I r_1^2 I r_2^2 = ( r_1 r_2 )^2= ( 1 2 )^2 \\ & M _1 M _2 = 1 4 aligned aligned
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