1. ʻElua mau hoʻopiʻi kiko, QA = +8 μC a me QB = -5 μC, ua hoʻokaʻawale ʻia e kahi mamao r = 10 cm. He aha ka nui o ka ikaika uilaʻO ke kūpaʻa k = 8.988 x 109 Nm2C-2 = 9x109 Nm2C-2.
ʻIke ʻia:
Hoʻouka A (q A ) = +8 μC = +8 x 10 -6 C
Hoʻouka B (q B ) = -5 μC = -5 x 10 -6 C
k = 9 x 10 9 Nm 2 C −2
ʻO ka mamao ma waena o nā uku A a me B (r AB ) = 10 kenimika = 0.1 m
Makemake ʻia : Ka nui o ka ikaika uila
Lōlā:
ʻO ke ʻano o ke kānāwai o Coulomb :
Ka nui o ka ikaika uila:
ʻAʻole maopopo
2. ʻElua mau ʻāpana i hoʻopiʻi ʻia e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. Ua hoʻokaʻawale ʻia ʻo Q P = +10 μC a me Q q = +20 μC e kahi mamao r = 10 cm. He aha ka nui o ka ikaika electrostatic.
ʻIke ʻia:
Hoʻouka P (Q P ) = +10 μC = +10 x 10 -6 C
Hoʻouka Q (Q Q ) = +20 μC = +20 x 10 -6 C
k = 9 x 10 9 Nm 2 C −2
ʻO ka mamao ma waena o nā uku P a me Q (r PQ ) = 12 kenimika = 0.12 m = 12 x 10 -2 m
Makemake ʻia: Ka nui o ka ikaika uila
Lōlā:
ʻAʻole maopopo
3. Ua hoʻonohonoho ʻia ʻekolu mau ʻāpana i hoʻopiʻi ʻia ma kahi laina e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. ʻO ke kumukūʻai A = -5 μC, ʻo ke kumukūʻai B = +10 μC a me ke kumukūʻai C = -12 μC. E helu i ka ikaika electrostatic net ma ka ʻāpana B ma muli o nā kumukūʻai ʻelua ʻē aʻe.
ʻIke ʻia:
Hoʻouka A (q A ) = -5 μC = -5 x 10 -6 C
Hoʻouka B (q B ) = +10 μC = +10 x 10 -6 C
Hoʻouka C (q C ) = -12 μC = -12 x 10 -6 C
k = 9 x 10 9 Nm 2 C −2
ʻO ka mamao ma waena o nā ʻāpana A a me B (r AB ) = 6 kenimika = 0.06 m = 6 x 10 -2 m
ʻO ka mamao ma waena o nā ʻāpana B a me C (r BC ) = 4 cm = 0.04 m = 4 x 10 -2 m
Makemake ʻia: ʻO ka nui a me ke kuhikuhi o ka ikaika electrostatic net ma ka ʻāpana B
Lōlā:
ʻO ka ikaika ʻupena ma ka ʻāpana B ka huina vector o ka ikaika F BA i hoʻokau ʻia ma luna o ka ʻāpana B e ka ʻāpana A a me ka ikaika F BC i hoʻokau ʻia ma luna o ka ʻāpana B e ka ʻāpana C.
ʻO ka ikaika F BA i hoʻokau ʻia ma luna o ka ʻāpana B e ka ʻāpana A:
Kuhikuhi ke kuhikuhi o ka ikaika electrostatic i ka ʻāpana A (kuhikuhi i ka hema).
ʻO ka ikaika F BC i hoʻokau ʻia ma luna o ka ʻāpana B e ka ʻāpana A:
Kuhikuhi ke kuhikuhi o ka ikaika electrostatic i ka ʻāpana C (kuhikuhi i ka ʻākau).
ʻO ka ikaika electrostatic net ma ka ʻāpana B :
F B = F AB – F BC = 675 N – 125 N = 550 Newtons.
ʻO ke kuhikuhi o ka ikaika electrostatic upena ma ka ʻāpana B e kuhikuhi ana i ka ʻāpana C (e kuhikuhi ana i ka ʻākau).
ʻAʻole maopopo
4. Ua hoʻokaʻawale ʻia ʻo +Q 1 = 10 μC, +Q 2 = 50 μC a me Q 3 e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. He aha ka uku electrostatic ma ka ʻāpana 3 inā ʻaʻohe ka ikaika electrostatic net ma ka ʻāpana 2.
ʻIke ʻia:
Hoʻouka 1 (q 1 ) = +10 μC = +10 x 10 -6 C
Hoʻouka 2 (q 2 ) = +50 μC = +50 x 10 -6 C
ʻO ka mamao ma waena o nā uku 1 a me 2 (r 12 ) = 2 kenimika = 0.02 m = 2 x 10 -2 m
ʻO ka mamao ma waena o ka hoʻouka 2 a me ka hoʻouka 3 (r 23 ) = 6 kenimika = 0.06 m = 6 x 10 -2 m
ʻO ka ikaika electrostatic net ma ka ʻāpana 2 (F 2 ) = 0
Makemake ʻia : hoʻouka 3 (q 3 )
Lōlā:
ʻO ka ikaika ʻupena ma ka ʻāpana 2 ka huina vector o ka ikaika F 21 i hoʻokau ʻia ma ka ʻāpana 2 e ka ʻāpana 1 a me ka ikaika F 23 i hoʻokau ʻia ma ka ʻāpana 2 e ka ʻāpana 3.
ʻO ka ikaika F 21 i hoʻokau ʻia ma luna o ka ʻāpana 2 e ka ʻāpana 1:
Kuhikuhi ke kuhikuhi o ka ikaika electrostatic i ka ʻāpana 3 (kuhikuhi i ka ʻākau).
ʻO ka ikaika F23 i hoʻokau ʻia ma ka ʻāpana 2 e ka ʻāpana 3: 
Kuhikuhi ke kuhikuhi o ka ikaika electrostatic i ka ʻāpana 1 (kuhikuhi i ka hema).
ʻO ka ikaika electrostatic net ma ka ʻāpana 2 = 0:
