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# problems_all - PHY2061 R D Field Chapter 25 Problems...

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PHY2061 R. D. Field Problems Chapter 25 Page 1 of 3 +Q d x +Q q Chapter 25 Problems Problem 1: A +15 microC charge is located 40 cm from a +3.0 microC charge. The magnitude of the electrostatic force on the larger charge and on the smaller charge ( in N ) is, respectively. Problem 2: Two point particles have charges q 1 and q 2 and are separated by a distance d . Particle q 2 experiences an electrostatic force of 12 milliN due to particle q 1 . If the charges of both particles are doubled and if the distance between them is doubled , what is the magnitude of the electrostatic force between them ( in milliN )? Problem 3: Two identical point charges +Q are located on the y-axis at y=+d/2 and y=-d/2 , as shown in the Figure . A third charge q is placed on the x- axis. At what distance from the origin is the net force on q a maximum ? Problem 4: Two 2.0 gram balls hang from lightweight insulating threads 50 cm long from a common support point as shown in the Figure. When equal charges Q are place on each ball they are repelled, each making an angle of 10 degrees with the vertical. What is the magnitude of Q , in microC? Q L θ Q r T

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PHY2061 R. D. Field Problems Chapter 25 Page 2 of 3 Problem 5: Four point charges q , Q , -2Q , and Q form a square with sides of length L as shown in the Figure . What is the magnitude of the resulting electrostatic force on the charge q due to the other three charges? Problem 6: Two 2.0 gram charged balls hang from lightweight insulating threads 1 m long from a common support point as shown in the Figure . If one of the balls has a charge of 0.01 microC and if the balls are separated by a distance of 15 cm , what is the charge on the other ball ( in microC )? Problem 7: A charge +Q is fixed two diagonally opposite corners of a square with sides of length L . On another corner of the square a charge of +5Q if fixed as shown in the Figure . On the empty corner a charge is placed, such that there is no net electrostatic force acting on the +5Q charge. What charge is placed on the empty corner? Problem 8: Three point charges Q , 2Q , and 4Q form a triangle with sides of length L and 2L as shown in the Figure . What angle does the resulting electrostatic force on the charge Q make with the positive x-axis ( in degrees )? +Q +Q +5Q L L q Q q -2Q L L Q Q2 L=1 m Q1 L=1m x = 15 cm θ θ θ Q 4Q 2Q F L 2L
PHY2061 R. D. Field Problems Chapter 25 Page 3 of 3 Problem 9: Two identical point charges +Q are located on the y-axis at y=+d/2 and y=-d/2 and a third charge - 2Q is located at the origin as shown in the Figure . The three charged +Q, +Q, and -2Q form an electrically neutral system called an electric quadrupole . A charge q is placed on the x-axis a distance x = d from the quadrupole. At what is the net force on q due to the quadrupole ? Problem 10: In the previous problem, what is the magnitude of force on the charge q when x becomes very large compared to the quadrupole separation d .

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problems_all - PHY2061 R D Field Chapter 25 Problems...

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