Mathematics · Magnetic Effects of Current
A coaxial cable consists of an inner wire of radius a surrounded by an outer shell of inner and outer radii b and c respectively. The inner wire carries an electric current i0 which is distributed uniformly across its cross-sectional area. The outer shell carries an equal current in the opposite direction, distributed uniformly. What will be the ratio of the magnetic field at a distance x from the axis when (i) x < a and (ii) a < x < b?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1x2a2✓
- 2x2b2 - a2
- 3b2 - a2x2
- 4a2x2
Correct answer
x2a2
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