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An electron enters the region between the plates of a parallel plate capacitor at an angle `theta` to the plates. The plate width is `l`, the plate separation is `d`. The electron follows the path shown just missing the upper plate. Neglect gravity. Then, `A. `tantheta=2d/l`B. `tantheta=4d/l`C. `tantheta=8d/l`D. The data given is insufficient to find a relation between d, l and `theta` |
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Answer» Correct Answer - B Horizontal range, `R=(2u_x xxu_y)/g=l`…….i Maximum height `H=u_y^2/(2g)=d`……..ii Dividing eqn ii by eqn i we have `1/4(u_y/u_x)=d/l` or `u_y/u_x=(usintheta)/(ucostheta)` `=tantheta=(4d)/l` |
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