QCEVault

Electromagnetism — Question 257

Original QCE Vault practice · 1 mark

Q257 · Practice questionSimple familiar1 mark

QUESTION 257

Two small identical spheres carry equal positive charges qq. Their centres are 0.200 m0.200\,\mathrm m apart and they repel with force 0.0900 N0.0900\,\mathrm N. Use k=9.00×109 N m2 C−2k=9.00\times10^9\,\mathrm{N\,m^2\,C^{-2}}. What is qq?
(A)
4.00×10−13 C4.00\times10^{-13}\,\mathrm C
(B)
4.00×10−7 C4.00\times10^{-7}\,\mathrm C
(C)
6.32×10−7 C6.32\times10^{-7}\,\mathrm C
(D)
2.00×10−6 C2.00\times10^{-6}\,\mathrm C
Question linkSyllabus coverage

Related questions

  1. Q109 · Original practice · 1 mark
    At the midpoint between two equal positive point charges, the electric field is
    Electromagnetism
  2. Q110 · Original practice · 1 mark
    A straight wire carries conventional current north in a uniform magnetic field directed east. The magnetic force on the wire is
    Electromagnetism
  3. Q111 · Original practice · 1 mark
    A conducting loop is pulled out of aa region where a magnetic field is directed into the page. While the flux into the page is decreasing, the induced field is
    Electromagnetism
  4. Q112 · Original practice · 1 mark
    An ideal transformer has 600600 turns on its primary and 150150 turns on its secondary. A 240 Vrms240\,\mathrm{V} rms supply is connected to the primary. The secondary voltage is
    Electromagnetism