Two point charges are located on the x-axis of a coordinate system: q_1 = 1.0 nC

Question

Two point charges are located on the x-axis of a coordinate system: q_1 = 1.0 nC is at x = + 2.0 cm, and q_2 = -3.0 nC is at x = +4.0 cm. What is the electric force (magnitude and direction) by q_2 on charge q_1? A charge is placed in a closed box. If the size of the box doubles, the electric flux going through the box reverses the sign but keeps the same magnitude keeps the same, doubles. is only half of the original flux. A flat sheet of paper of area 0.50 m^2 is oriented so that normal to the sheet is at an angle of 60 to a uniform electric field of N/C. Find the magnitude of the electric flux through the sheet. A hollow conducting sphere has a charge the following statement is incorrect? The charge on the inner surface is zero. The charge on the outer surface is zero. The electric field is zero at all points within the conductor The electric field is zero at all points inside the cavity.

Explanation / Answer

1)
since q1 and q2 have opposite sign, they should attract each other
So force direction on q2 will be in negative x direction

r = 4-2= 2 cm = 2*10^-2 m

|F| = K*q1*q2/r^2
= (9*10^9)*(1*10^-9)*(3*10^-9) / (2*10^-2)^2
= 6.75*10^-5 N

Answer:
magnitude : 6.75*10^-5 N
direction : along negative x axis

2)
Flux = qenclosed/ebsoleneo
It will not change
Answer: B

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