Physics

2 uncharged metal spheres #1 and #2, are mounted on insulting support rods. A third metal spheres, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state

#1 carries positive charge and #2 carries negative charge

2 point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to electrical force that each charge exert on the other one?

1/4 f

A small charged plastic ball is vertically above another charged small ball in a frictionless test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the equilibrium distance between the balls in the test tubes would become

2d

too small identically charge balls are a certain distance apart. The vectors in the figure shown the magnitude and the direction of the electrostatic force on each ball due to the other one. supposed that the charge on the left ball is now doubled ( represented by two plus signs) which vector diagram below represents the forces that now act on each of the two ball

<———++ +———>

Four point charges of equal magnitudes but with varying signs are arranged on 3 of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge?

A

Four point charges of varying magnitude and sign arranged ont he corners of the square of side d as shown in the figure. Which one of the arrows represents the net force acting on the point charge with a charge +Q

A

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

A

Three equal-magnitude point charges of varying signs 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

3 equal charges +Q are at 3 of the corner le of a square of side d. A fourth charge +Q of equal magnitudes is at the center of the square as 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 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?

C

Four point charges Q of equal magnitude and sign are arranged on 3 of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square

D

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?

Double the charge to 2Q

Electrically neutral objects can not exert on electrical force in each other, but they can exert a gravitational force on each other

False

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulted from ground. It is allowed to touch the spheres for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod

Is repelled by the spheres

2 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 happens to the electrical force that each charge exerts on the other one?

It remains the same

In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. As q moved away from Q, what is true about the motion of q? (There may be more than one correct choice)

It will move with decreasing acceleration. It will move with increasing speed

The figure shows electric field lines arising from two small charged particles P and Q. Considers the following two statements

Only 1 is true, The charge on P is smaller than the charge on Q.

A negatively- charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connect is removed (without touching the spheres), and after that the rod is also removed. The sphere is now

Positively charged

2 stationary point charges q1 and q2 are shown on the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch?

Q1 is negative and Q2 is postitive, the magnitude of Q1 is less than the magnitude of Q2

2 very small plastic balls of equal mass are released from rest. One of them carries +10 nC of excess charge and the other one carries +1 nC of charge. No other charges or fields are presented. Which of the following statements are true about them as they move away from each other?

The balls always have acceleration of equal magnitude. The speed of the ball keeps increasing

A hydrogen nucleus, which has a charge +e, is situated to the left of carbon nucleus, which has a charge of +6e. Which statement is true

The electrical force experience by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus

2 tiny beads are 25 cm apart with no other charges or fields presents. Bread A carries 10 nC of charge and bead B carries 1 nC. Which one of the following statements is true about the magnitudes of the electric forces on these beads?

The force on A is exactly equal to the force on B

A negatively-charged rod is brought close to (but does not touch) 2 neutral spheres that are in contact with each other but insulated from the ground. If the 2 spheres are then separated, what kind of charge will be in the spheres?

The sphere near the charge rod becomes positive and the other one becomes negative

An electron and proton are released simultaneously from rest and start moving toward each there due to their electrostatic attraction, with no other forces presents. Which of the following statements are true just before the are about to collide

They are closer to the initial position of the proton than to the initial position of the electron

If 2 objects are electrically attracted to each other

They are electrically neutral

An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (x,y,z, or w) will the electron follow in the field?

Trajectory Z

The figure shows two unequal +q and -Q. Charge -Q has greater magnitude than charge +q. Point X is midway between the charges. In what section of the line will there be a point where the resultant electric field is zero

Upward and downwards to the left

The electric field At point P due to a point charge W a distance R away from P had magnitude E. In order to double the magnitude of the field at P, you could

VW

X and Y are 2 initially uncharged metal spheres on insulting stands, and they are in contact with each other. A positively charged rod R is brought close to X as shown in part (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y?

X is negative and y is positive

2 equal and opposites charges are a small distance apart, forming an electric dipole. A positive charge +q is placed above these charges, as shown in the figure, equidistant from both of them. Which of the diagram best gives the direction of the net force the dipole exerts on the charge +q

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