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2 objects of 4C & –9C are placed 1 m from each other. At what distance from the 4C will the electric field be zero ? |
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Answer» ctric field will be zero at a point where the forces EXERTED by CHARGES 4q and Q on a test charge q 0 are equal and opposite. Let this point be at a DISTANCE x from 4q, then its distance from q=30−x. If F 1 is force due to 4q and F 2 due to q, then F 1 =F 2 ,i.e., 4πϵ 0 1 x 2 4q×q 0 = 4πϵ 0 1 (30−x) 2 q×q 0 (or) x 2 4 = (30−x) 2 1 ⇒2(30−x)=x(or) x=20cm. |
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