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A.) A voltmeter reads 50.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 11.5 V .

What is the dielectric constant of this material? If found the answer to the first part which was K= 4.35.

B.) What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?

This is the part i can't get, i know C=Q/V and also that C1 + C2 = Ceq, how to do go about finding the this part B ?