First slide

Capacitors and capacitance

Question

Two parallel plates have equal and opposite charge. When the space between them is evacuated the electric field between the plates is $2 \times 10^{5} V / m$ . When the space is filled with dielectric the electric field becomes $1 \times 10^{5} V / m$ . The dielectric constant of the dielectric material is

Easy

A

$1 / 2$
B

1
C

2
D

3

Solution

$K = \frac{E_{w i t h o u t d i e l e c t r i c}}{E_{w i t h d i e l e c t r i c}} = \frac{2 \times 10^{5}}{1 \times 10^{5}} = 2$

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