Maxwell ne socha ki sirf current hi magnetic field nahi banti, balki changing electric field bhi banati hai. Isi ko unhone displacement current ka naam diya. Jab capacitor charge ho raha hota hai, toh Ampere ka purana law fail ho jata tha, lekin is naye concept ne gap bhar diya.
Yeh theory door ki baat lagti hai, par mere borewell ke motor ki winding repair karte waqt maine dekha — wires mein achanak badalta voltage bhi ek tarah ki ‘current’ hi to hai, jo field paida karti hai. Maxwell sahib bhi shayad kisi practical jhijhak se hi aage badhe honge.
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