1. Two charges, one is 3 nC and another one is 21 nC are separated by 1 m distan

Question

1. Two charges, one is 3 nC and another one is 21 nC are separated by 1 m distance. Calculate distance from the smaller charge where electric field will be zero.
2. How many electrons have to be added to 1 gram metal sphere such that another +1C charge located 23 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].

3. Two point charges, q= +16 nC and q= -6 nC, are located on the x-axis at x= 0 and x=9 m. What is the distance of ZERO electric field from the positive charge?

1. Two charges, one is 3 nC and another one is 21 nC are separated by 1 m distance. Calculate distance from the smaller charge where electric field will be zero.
2. How many electrons have to be added to 1 gram metal sphere such that another +1C charge located 23 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].

3. Two point charges, q= +16 nC and q= -6 nC, are located on the x-axis at x= 0 and x=9 m. What is the distance of ZERO electric field from the positive charge?

1. Two charges, one is 3 nC and another one is 21 nC are separated by 1 m distance. Calculate distance from the smaller charge where electric field will be zero.
2. How many electrons have to be added to 1 gram metal sphere such that another +1C charge located 23 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].

3. Two point charges, q= +16 nC and q= -6 nC, are located on the x-axis at x= 0 and x=9 m. What is the distance of ZERO electric field from the positive charge?

Explanation / Answer

1.)

E = kq/r^2

If field is zero

E1 = E2

kq1/r1^2 = kq2/r2^2

3/x^2 = 21 / (1-x)^2

x = 0.274m

2.)

Fg = Fc

mg = Eq

10^-3 x 9.8 = k q/ (0.023)^2 x1

q = 10^-3 x 9.8 x 0.023^2 / 9 x 10^9 = 5.76 x 10^-16 C

but q = ne

n = q/e = 5.76 x 10^-16 / 1.6 x 10^-19

= 3600

3. ) same as 1

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