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Two point charge +q and -q are fixed on diameterically opposite point on the unirom ring, such that -q is at bottom and is contact will a perfect insulator incline plane. Total mass is equal to m remains in equilibrium on the rough inclined plane in the presence of uniform vertical electric field. Then A. the value of friction force is `mg sin theta`B. the value of friction force is less than `mg sin theta`C. the value of electric field is `(mg)/(2q)`D. the value of electric field is `(mg tan theta)/(2q)` |
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Answer» Correct Answer - A::C `f = mg sin theta` and `PE sin theta = mg sin theta R` `q 2R E sin theta = mg sin theta R` `E = (mg)/(2q)`. |
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