The figure shows a section of three long charged cylinders centered on the same

Question

The figure shows a section of three long charged cylinders centered on the same axis. Central cylinder A has a uniform charge qA= +3q0.

a. With what uniform charges qB and qC on cylinders B and C the net elestric field is zero at point 1?

5.qB= +3q0, qC= -3q0

(b) With what uniform charges qB and qC on cylinders B and C the net elestric field is zero at point 2?

5. qB= +3q0, qC= -3q0

c. With what uniform charges qB and qC on cylinders B and C the net elestric field is zero at point 3?

Explanation / Answer

(a)

Electric field at point 1 can never be zero, for any charges on B and C,

as total charge enclosed is not zero. So, option ''that's impossible'' is correct.

(b)

Electric field at 2 can be zero if total charge enclosed is zero.

So, qB + qA = 0, Here, qB = -3q0

qC can be any value

(c) point 3 is zero, if qB + qC = -3q0

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