What sense can people use to detect infrared radiation? we can see it as red light, we can feel it as heat, we can hear it as a loud noise, or we can smell it as fresh air

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?