***This post has two questions in it because I am running out of questions left
ID: 1339152 • Letter: #
Question
***This post has two questions in it because I am running out of questions left in my subscription. So, please don't tell me to ask the second question in a separate post.
QUESTION 1: Consider the three situations 1, 2, and 3 of charged particles entering a magnetic field as indicated in the figure below (+ corresponds to a field into the paper and . corresponds to a field out of the paper). Give all possible correct answers.
A) The particle in '1' is deflected to the top.
B) The particle in '2' is deflected to the left.
C) The particle in '3' is deflected to the bottom
**I have already tried answering AC and BC into CAPA and it said those are incorrect.
QUESTION 2: A uniform magnetic field is directed out of the page. Because of the presence of a tenuous gas in the region, a charged particle moving in the plane of the page follows a clockwise spiral of decreasing radius as shown.
Give all possible correct answers (i.e., B, AC, BCD...).
A) The magnetic force is doing non-zero work on the charge.
B) The charge is positive.
C) The charge is slowing down.
D) The magnitude of the momentum of the particle is decreasing.
E) The acceleration vector of the particle is constant.
**I have already tried answering: B ; BE ; ABD ; BC (they are all incorrect answers)
Explanation / Answer
F= q*(VxB)
So, direction of deflection will be given by cross product of V and B multiplies by sign of q
In 1st diagram:
vxB is down and q is negative. So deflection is top
In 2nd diagram:
vxB is left and q is positive. So deflection is left
In 3rd diagram:
vxB is down and q is positive. So deflection is down
Answers:A,B,C
-------------------------------------------------------------------
A) correct
since V and B are perpendicular. Magnetic field does 0 work
B)false
Charge is negative
C)True
R=M*V/q*B
Since R is decraesing, v must be decreasing
D)True
momentum= m*V
E) False
centrepetal acceleration = v^2/r
its changing in direction always.
So its not constant
Answer: A,C,D
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.