1. Two point charges are located on the x-axis. First charge 1.0 n C is 2.0 cm a
ID: 2119732 • Letter: 1
Question
1. Two point charges are located on the x-axis. First charge 1.0 n C is 2.0 cm and second charge -3.0 n C is 4.0 cm from origin. What is the total force exerted by these two charges on a third charge 5.0 n C located at the origin?
2.Two identical small conducting spheres are separated by 0.60 m. The spheres carry different amounts of charge and each sphere experiences an attractive electric force of 10.8N. The total charge on the two spheres is -24 %u03BCC. The two spheres are now connected by a slender conducting wire, which is then removed. The electric force on each sphere is closest to.
3. A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C i. If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s2 i, what is the charge that it carries?
4. A 5.0-%u03BCC point charge is placed at the 0.00 cm mark of a meter stick and a -4.0-%u03BCC point charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field due to these charges equal to zero?
Explanation / Answer
2)
On joining then with a wire, charge flows so that charges on them become equal , so charge on each sphere
= q1+q2/2
= -24/2 = -12 micro C
F = ( 1/4 p epsilon) q1 q2 / r^2
= (9*10^9 * 144 * 10-12C) / (0.36 m2)
= 3.6 N repulsive
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