I need some serious help, I have to turn this in about an hour. I need some seri

Question

I need some serious help, I have to turn this in about an hour. I need some serious help, can you explain everything to me.

I don't need P3 but if you happen to get an answer other than +4.9 cm let me know.

P3: A Q +40-C charge is positioned on the x axis at x 4.0 cm. Where should a be placed to produce a net electric field of zero at the origin? a. -5.3 cm e. +6.0 cm 4.0 cm. where should a Q,--60-C charge b. +5.7 cm f. none of the above ·+4.9 cm d.-6.0 cm Q4: If the value of Qi is increased to +60-uC (note that it is equal to Q in magnitude now in magnitude now), where is the net ficld zero on x-axis other than infinity? a. on the right of Q1 b. on the left of Q e. between Q, and Q2 f. c. on the right of Q2 d. on the left of Q2 Nowhere as zero field point does not exist for this situation. 0-m length of a long cylinder (radius 4.0 mm) has a charge of 4.0 nC distributed uniformly P4: A 2. throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder? a. 9.9 kN/C e. 18 kN/C b. 8.1 kN/C f none of these c. 9.0 kN/C d. 7.2 kNIC

Explanation / Answer

(3)
Q1 = + 40 uC
Q2 = - 60 uC
r1 = 4.0 cm = 0.04 m

Net Electtric Field at origin = 0
k*Q1/r1^2 = k*Q2/r2^2
40/0.04^2 = 60/r2^2
r2 = 0.0489 m
r2 = 4.9 cm

Correct option :- (c)

(4)
As Q1 = Q2 in magnitude,
In this case No zero field point exists !!

Correct option :- (f)

(5)
E = Q/(2**eo*r*L)
E = (4.0 * 10^-9)/ (2** 8.85*10^-12* 5.0*10^-3 * 2.0)
E = 7.2 k N/C

Correct option :- (d)

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