10 Simple physics multiple choice problems The figure on right shows an electron
ID: 1439202 • Letter: 1
Question
10 Simple physics multiple choice problems
The figure on right shows an electron moving with constant speed entering a region where there is a uniform electric field as shown by the red arrows When inside the electric field what is the direction of the acceleration of the electron? 1. (a) +x (c) y (e) It does not accelerate. It will continue to move with constant speed. (d) -y 2. The figure on right shows a proton moving with constant speed entering a region where there is a uniform electric field as shown by the red arrows. When inside the electric field in which direction will it move? (a) +x (c) y (e) between +x and+ (d) -y e) between +x and*y (6) between +x and y (g) between -x and +y(h) between -x and -y Questions 3-4: An electron is placed in an electric field and given an initial velocity such that it will start moving in the direction shown by the thick arrow (1). 3. What is the direction of the force from the electric field on this moving electron (after it has started to move)? (a) 1 (d) 4 (b) 2 (e) None of these is correct (c) 3 4. In which direction will the electron move shortly after it is projected? (a) 1 (d) 4 (f) between 2 and 3 (b) 2 (e) between 1 and 2 (g) between 3 and 4 (c) 3 (h) between 1 and 4Explanation / Answer
1) b) -x
2) a) +x
3) d) 4
4) h) between 1 and 4
5) e) lamda = 2*Q/(pi*R)
6) a) +x
7) f) between +x and -y
8) e) 9E
9) d)
10) b)
we know, F = q*E
if q is positive F and E have same direction.
if q is negative E and F are opposite in direction .
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