A metal rod of resistance 20 Ω Ω is fixed along a diameter of conducting ring of radius 0.1 m and lies in x-y plane. There is a magnetic field 
. The ring rotates with an angular velocity ω = 20 rad/s about its axis. An external resistance of 10 Ω Ω is connected across the center of the ring and rim. The current through external resistance is
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Here, resistance of rod 
, 
along 
-axis; 
.
Potential difference between center of the ring and the rim is
The equivalent circuit of the arrangement is shown in figures.
Current through external resistance,
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