If a 5.0 C charge is 10 m from a - 2.0 C charge. The electrostatic force on the
ID: 1621017 • Letter: I
Question
If a 5.0 C charge is 10 m from a - 2.0 C charge. The electrostatic force on the positive charge is A) 9.0 times 10^8 N toward the negative charge B) 9.0 times 10^8 N away from the negative charge C) 9.0 times 10^9 N toward the negative charge D) 9.0 times 10^9 N away from the negative charge E) none of these If electrical charge is put on a spherical nonconductor (electrical insulator), A) it remains where it was placed B) it spreads a little from where it was placed but not over the whole sphere C) it spreads uniformly over the surface of the sphere if the sphere is small D) it spreads uniformly throughout the volume of the conductor E) it spreads uniformly over the surface of the sphere An electric dipole consists of a particle with a charge of +6 times 10^-6 C at the origin and a particle with a charge of -6 times 10^-6 C on the x axis at x = 3 times 10^-3 m. Its dipole moment is: A) 1.8 times 10^-8 C m, in the positive x direction B) 1.8 times 10^-8 Cm, in the negative x direction C) 0 C m, because the net charge is 0 D) 1.8 times 10^-8 C m, in the positive y direction E) 1.8 times 10^-8 Cm, in the negative y direction 4. A 10 Ohm resistor has a constant current flowing through it. If 1200 C of charge flows through it in 4 minutes what is the value of the current? A) 3.0 A B) 5.0 A C) 20 A D) 120 A E) 300 A Four 20-Ohm resistors are connected in parallel and the combination is connected to a 20-V emf device. The current in the device is: A) 0.25 A B) 1.0 A C) 4.0 A D) 5.0 A D) 100 AExplanation / Answer
1.
F = kq1q2/r^2
F = 9*10^9*5*2/10^2
F = 9*10^8 N
force will be attractive towards the negative charge.
Correct option is A.
4.
i = dQ/dt
i = 1200/4*60 = 5 Amp.
Correct option is B.
5.
1/Req = 1/20 + 1/20 + 1/20 + 1/20
Req = 5 ohm
i = V/Req = 20/5 = 4 Amp.
Correct option is C.