Phy140 Ch 19, MC
Three equal charges +Q are at three of the corners of a square of side d. A fourth charge of +Q of equal magnitude is at the center of the square shown in the figure. Which one of the arrows shown represents the NET FORCE acting on the charge at the center of the square?
B
Three equal negative point charges -q are placed at three of the corners of a square of side d shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?
B
Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?
B
Three equal negative point charges -q are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
C
The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
Double the charge to 2Q
If two objects are electrically attracted to each other,
One object must be negatively charged and the other object must be positively charged.
The figure shows electric field lines arising from two small charged particles P and Q. Consider the following statements: (i) The charge on P is smaller than the charge on Q. (ii) The electrostatic force on P is smaller than the force on Q. Which of the following is true?
Only (i) The charge on P is smaller than the charger on Q.
A particle traveling horizontally enters a region where a uniform electric field is directed upward. The particle experiences an upward force once it has entered the field. What is the charge on the particle?
Positive charge
Two charged particles, A and B are located near each other. The magnitude of the force that particle A exerts on particle B is independent of,
The sign of charge on B
When a glass rod is rubbed with silk cloth, the rod becomes positively charged as,
negative charges are transferred from the rod to silk
The electrostatic force between two 1.0C point charges separated by a distance of 1.0m is
0.89N
Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually diminishes on both spheres by leaking off. When each of the spheres has lost half of its initial charge, what will be the magnitude of the electrostatic force on each other?
1/4 F
Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the point charge with a charge +Q?
A
Three equal positive point charges +q are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A
The magnitude of the electric field at a distance of two meters from a positive point charge is E. What is the magnitude of the electric field at the same location, if the magnitude of the charge is doubled?
E/2
Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are halved and their separation is also halved, what happened to the electrical force that each charge exerts on the other one?
It remains the same.
An electron and proton are released simultaneously from rest and start moving towards each other due to their electrostatic attraction, with no other forces present. What is true about before they collide?
They are closer to the initial position of the proton that to the initial position of the electron.
