JEE Main20257 Apr 2025Morning ShiftPhysicsMagnetic Properties of MatterActual
The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility . _ mg =1.2 10⁻⁵ ) is :
Options
- A6 5 10⁻³ %
- B5 6 10⁻⁵ %
- C5 6 10⁻⁴ %
- D5 3 10⁻⁵ %
Correct answer
A. 6 5 10⁻³ %
Step-by-step solution
aligned & % change in B= B_ new -B_ old B_ old 100 % & = ni - ₀ ni ₀ ni 100 %= ( - ₀ ) ₀ 100 % & = ( ₀ _ r - ₀ ) ₀ 100 % & = ( _ r -1 ) 100 % & = _ n 100 % & =1.2 10⁻³ % aligned