Please answer these questions and show all your work! Q1) A wire lying in the pl
ID: 1518841 • Letter: P
Question
Please answer these questions and show all your work!
Q1) A wire lying in the plane of this page carries a current directly toward the top of the page. What is the direction of the magnetic force this current produces on an electron that is moving perpendicular to the page and outward from it on the left side of the wire?
A) perpendicular to the page and towards you
B) perpendicular to the page and away from you
C) toward the top of the page
D) toward the bottom of the page
E) The force is zero.
Q2) An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm. Where is the image?
A) 13 cm from the mirror
B) 7.0 cm from the mirror
C) 4.3 cm from the mirror
D) 3.3 cm from the mirror
Q3) How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?
A) 46 mm
B) 52 mm
C) 58 mm
D) 67 mm
Explanation / Answer
Q1) B =uoi/2pi*d
F = q(vxB)
correct option is (A)
Q2) f = 3 cm (concave) , u =10 cm
from mirror formula (1/f) =(1/u) +(1/v)
(1/3) = (1/10) +(1/v)
v =4.3 cm
correct option is (C)
Q3) f = 50 mm ,
v/u = 3
v = 3u
from lens formula
1/50 = (1/u) +(1/(3u))
u =67 mm
correct option is (D)