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work sheet-class xii

ARMY PUBLIC SCHOOL GOLCONDA

WORK SHEET-I
PHYSICS

XII

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1.    A charge of -2 x 10^-6 C experiences a force of 0.08 N [left]. What is the electric field at that point?

2.      A charge of +3.0 x 10^-6 C is 0.25 m away from a charge of -6.0 x 10^-6C.
a. What is the force on the 3.0 x 10^-6 C charge?
b. What is the force on the -6.0 x 10^-6 C charge?

       3.  Three charges, q₁ = 4 x 10^-6 C, q₂ = -2 x 10^-6 C, and q₃ = 5 x 10^-6 C are

placed at the corners of a square with sides 0.30 m. What is the field

at the fourth corner?

4. Four point charges form the vertices of a square with sides = L. Two diagonally opposite charges have a charge of 2√2 μC each. The other two charges are identical to each other and each has a charge, q. If there is no net force on either of the 2√2 μC points, what is the value of q?

5. Two point charges lie on the x-axis. A charge of +9 μC  is at the origin, and a charge of -4 μC is at x=10cm.

a. At what position x would a third charge q3 be in equilibrium?
b. Does your answer to part a depend on whether q3 is positive or negative? Explain.

6. Four particles each with a positive charge of q are placed on the vertices of a square having sides L. A fifth particle with a positive charge Q is placed at the center of the square. What is the force on the particle at the center of the square?

7. A charge of 6.00*10^-9 C and a charge of -3.00*10^-9 C are separated by a distance of 60.0 cm. Find the position at which a third charge of 12.0*10^-9 C can be placed so that the net electrostatic force on it is zero.

8. Two charges, +q and 4q, are 1 m apart. What are the location, magnitude and sign of a third charge, Q, placed so that the entire system is at equilibrium?

9. A +2.0 μC charge is located on the x-axis at +0.3 m and another at -0.3 m. A third charge, +4.0 μC, is located on the y-axis at +0.4m. Find

a. the net force on the third charge

b. the electric field at (0,-0.4m)

Date of submission:    3^rd April in separate note book                        standard: easy

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