The electric field due to a uniformly charged wire is expressed as:
Here, λ is the charge per unit length, r is the distance of a point from the wire.
We're given that at r = 2 cm, E2 = 20 N/C
Charge is distributed uniformly along a long straight wire. The electric field 2 cm from the wire is 20 N/C. The electric field 4 cm from the wire is?
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