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Q.

A rod of length 2.4 m and radius 4.6 mm carries a negative charge of 4.2 × 10–7 C spread uniformly over it surface. What is the electric field near the mid–point of the rod, at a point on its surface?

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Detailed Solution

Here, l=2.4m, r=4.6 mm=4.6×10-3m q=-4.2×10-7C Linear charge density, λ=ql     =-4.2×10-72.4=-1.75×10-7C m-1 Electric field, E=λ2πε0r       =-1.75×10-72×3.14×8.854×10-12×4.6×10-3       =-6.7×105N C-1

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A rod of length 2.4 m and radius 4.6 mm carries a negative charge of 4.2 × 10–7 C spread uniformly over it surface. What is the electric field near the mid–point of the rod, at a point on its surface?