In step 2, how do you know that = q/r I know that = charge over the length. but

Question

In step 2, how do you know that = q/r I know that = charge over the length. but i dont get iswhy are we multiplying by in the denominator. In step 3, why are the limits -/4 to /4?? how didyou know that this was the limit... Also, why is one of the r's being mulitiplied by1/4??? Thanks... In step 2, how do you know that = q/r I know that = charge over the length. but i dont get iswhy are we multiplying by in the denominator. In step 3, why are the limits -/4 to /4?? how didyou know that this was the limit... Also, why is one of the r's being mulitiplied by1/4??? Thanks...

Explanation / Answer

We know that the linear charge density means, charge perunit length. That is = Q / l Here l is the length of the arc. We know that length of the arc (l) = radius Xangle                                               l = r SO the linear charge density is = Q /(l) SO the linear charge density is = Q /(l)                                         

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