정전기학 - 3 B Scientific 
 Plate capacitor used to investigate the relationship between electric charge and voltage , quantify capacitance as a function of plate spacing , measure the dielectric constant ε and precisely determine the electric field constant & epsilon . .. more 
 DC Power Supply , 450 V ( 115 V , 50 / 60 Hz ) 
 Electric Field Meter ( 115 V , 50 / 60 Hz )