An electron enters a uniform electric field between two parallel plates with speed u along the midline; the plates have length l. The electron emerges with deviation angle θ. Find k if θ = 6k degrees for the parameter condition indicated in the source (the equation in the supplied PDF has unreadable symbols).
Physics · Mixed Chapter
JEE Mains

Question

An electron enters a uniform electric field between two parallel plates with speed u along the midline; the plates have length l. The electron emerges with deviation angle θ. Find k if θ = 6k degrees for the parameter condition indicated in the source (the equation in the supplied PDF has unreadable symbols).

Physics · Mixed Chapter

G1 Physics · Accepted Answer

Explanation: In the field, horizontal velocity stays u and vertical acceleration is a=eE/m. Travel time is t=l/u and tan θ=(a t)/u=eEl/(mu²). Determine θ from the condition next to the illustration and divide the answer in degrees by 6 to find k. The condition is unreadable in the original PDF; printed key is 5, not independently verified.