A parallel-plate capacitor consists of two parallel, square ...

[Lobcity]

A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0 cm by 1.0 cm.
 
  If the plates are separated by 1.0 mm, and the space between them is filled with teflon, what is the capacitance of this capacitor? (The dielectric constant for teflon is 2.1, and 0 = 8.85  10-12 C2/N  m2.)
  A) 1.9 pF
  B) 0.44 pF
  C) 2.1 pF
  D) 0.89 pF

Question 2

What is the orbital radius of the n = 3 excited state in the Bohr model of the hydrogen atom? The ground-state radius of the hydrogen atom is 0.529  10-10 m.
 
  A) 0.476 nm
  B) 0.159 nm
  C) 0.381 nm
  D) 0.548 nm

[Benayers]

Answer to Question 1

A

Answer to Question 2

A

[Lobcity]

Thanks for the timely response, appreciate it

[Viet Thy]

Excellent