Rotary variable capacitor

A variable capacitor consists of two metal semicircles of radius RR with vertical separation d.d. The capacitor is charged when φ=0,\varphi=0, and is then disconnected from the voltage source. The discs are then rotated through the angle φ=90.\varphi = 90^\circ.

How does the rotation change the energy that's stored in the capacitor?

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