AdfTdAgenda for Today - U of T Physicsameyerth/phy132s17/Jam...Clicker Question 11: The figure shows three identical lightbulbs connected to a battery having a constant voltage across

Physics 132: Reviewys cs 3 e eElements of Physics II

A d f T dAgenda for Today ReviewReview

Physics 201: Lecture 1, Pg 1

Clicker Question 1: What is the sign of q?

(a) positive(b) negative(c) need more information(c) need more information


Clicker Question 2: A proton and an electron are held apart a distance of

1 m and then let go. Where would they meet?

a) in the middlea) in the middle

b) closer to the electron’s side

c) closer to the proton’s side

p e


A dipole is held motionless next to a fixed charge +Q. For theClicker Question 3:

A dipole is held motionless next to a fixed charge Q. For the situation below, when the dipole is released, which of the following describes the subsequent motion?

A Th di l t th i htA. The dipole moves to the right.

B. The dipole moves to the left.

C Th di l t t l k iC. The dipole rotates clockwise.

D. The dipole rotates counterclockwise.

E The dipole remains motionlessE. The dipole remains motionless.


Clicker Question 4:

A charged particle is traveling at speed v ItA charged particle is traveling at speed v. It encounters a static magnetic field oriented perpendicular to its path. The particle changes its

(a) speed ( = magnitude of the velocity).(b) direction(b) direction.(c) both its speed and direction.(d) neither its speed or direction(d) neither its speed or direction.(e) All of the above scenarios are possible.


The trajectory of the particle is best described asClicker Question 5:

(a) a helix.(b) a circle oriented in the plane of the page(b) a circle oriented in the plane of the page.(c) a circle oriented perpendicular to the page.


Clicker Question 6: A particle with charge 1 C and mass 1 kg moves in a uniform

magnetic field of magnitude 1 T pointing in the positive z directionThe initial velocity components of the particle are vx = 1 m/s, vy = 2 m/s and vz = 3 m/s. What is the subsequent motion of the zparticle?

A) It moves in a helix along the z direction with radius 2 2 mA) It moves in a helix along the z direction with radius 2.2 m.B) It moves in a helix along the z direction with radius 3.7 m.C) It moves in a helix along its initial direction with radius 2 2 mC) It moves in a helix along its initial direction with radius 2.2 m.D) It moves in a helix along its initial direction with radius 3.7 m.E) It moves in a circle at the initial speed.) p


Clicker Question 7: Two particles with equal but opposite charge are

emitted back-to-back at the same speed from the center of the diagram below. Their trajectories lie in g ja plane normal to the magnetic field that points into the page. The signs of the particles (positive or negative) are indicated by the "+" or "-" at the ends g ) yof the arrows. Which picture below could be correct?


Clicker Question 8:

What is the approximate direction of the electric fieldWhat is the approximate direction of the electric field at point B?

a) Leftb) Rightc) Upd) Downe) Zeroe) Zero


Clicker Question 9:

The image below shows two regions with electric The image below shows two regions with electric fields as labeled. Which point has the highest electric potential? Assume there are no other fields.

a) Ab) Bc) Cc) Cd) Cannot be determined


Clicker Question 10: The light bulbs and batteries in the two circuits are

id i l C P h l di i d bidentical. Compare P1 the total power dissipated by circuit 1, with P2 the total power dissipated by circuit 2.

a) P1< P2

b) P1= P2

c) P1> P2


Clicker Question 11: The figure shows three identical lightbulbs connected to a battery

having a constant voltage across its terminals. What happens to the brightness of lightbulb 1 when the switch S is closed? Assumethat the lightbulbs obey Ohm’s law and that all wires have zero resistance. Also assume that all batteries are ideal.

A) The brightness decreases permanently.B) The brightness remains the same as before the ) gswitch is closed.C) The brightness will decrease momentarily then return to its previous level.D) The brightness increases permanently.E) The brightness will increase momentarily then return to its previous level.


Clicker Question 12: The lightbulbs are identical. Initially both bulbs are glowing. What happens when the switch is closed?

A. Nothing.B. A stays the same;

B gets dimmer.C A t b i htC. A gets brighter;

B stays the same.D Both get dimmerD. Both get dimmer.E. A gets brighter;

B goes out.


B goes out.

Clicker Question 13: What is the resistance between point A and point B in this circuit?(a) 5 Ω(b) 10 Ω(c) 20 Ω(d) 40 Ω(e) 80 Ω(e) 80 Ω


Clicker Question 13: What is the resistance between point A and point B in this circuit?


Clicker Question 14: A small charged sphere with a mass of 200 g is suspended from

the ceiling by a string as below. A constant electric field of 5 N/C causes the string to make an angle of 35 with the vertical in equilibrium. What is the charge on the sphere?

(a) 3.47 × 10-1 C(b) 5 61 × 10 1 C(b) 5.61 × 10-1 C(c) 2.74 × 10-1 C(d) 8.34 × 10-1 C( ) 1 12 × 10 1 C(e) 1.12 × 10-1 C


Clicker Question 15: A charge is accelerated from rest through a potential difference V

and then enters a uniform magnetic field oriented perpendicular toits path. The field deflects the particle into a circular arc of radius R. If instead the accelerating potential were tripled to 3V, what would be the radius of the circular arc?

A) R/9A) R/9 B) R/ sqrt(3)C) sqrt(3) RC) sqrt(3) RD) 3RE) 9R)


Clicker Question 16: Initially, a particle with charge q and mass m travels between two

parallel charged plates in a straight line without being deflected, as shown in the figure. The plates are separated by 2 cm and are charged by a 200 V battery. Between the plates there is also some magnetic field of magnitude B = 0.2 T directed into the page. Then the charged plates are removed, the particle is observed to travel along a circular trajectory with a radius of 0.5 g j ycm. What is the charge to mass ratio (q/m) of the particle?


Clicker Question 17: Initially, a particle with charge q and mass m travels between two

parallel charged plates in a straight line without being deflected, as shown in the figure. The plates are separated by 2 cm and are charged by a 200 V battery. Between the plates there is also some magnetic field of magnitude B = 0.2 T directed into the page. Then the charged plates are removed, the particle is observed to travel along a circular trajectory with a radius of 0.5 g j ycm. Can you determine the sign of the charged particle? If so, is the particle positively or negatively charged? If not, why?


An electron is released in a region containing a constant

Clicker Question 18: g g

electric field. Which of the following is true concerning the electron:

(a) The electron will move in the direction of electric field lines ( )and towards a region of lower electric potential.

(b) The electron will move opposite the direction of electric field lines and towards a region of lower electric potential.lines and towards a region of lower electric potential.

(c) The electron will move opposite the direction of electric field lines and towards a region of higher electric potential.

(d) The electron will move in the direction of electric field lines(d) The electron will move in the direction of electric field lines and towards a region of higher electric potential.

(e) The electron will move along a line of constant potential.


Two charges are fixed on the x axis: Q = 4 μC is

Clicker Question 19:

Two charges are fixed on the x-axis: Q1 = -4 μC is located at x = 0, and Q2 = +9 μC is located at x = 5 m. A third charge will be brought onto the x-axis from infinity To which of the following points on thefrom infinity. To which of the following points on the x-axis could we bring that charge without doing any net work?

(a) x = 4 m(b) x = 2 m(c) x = 1 m(c) x = 1 m(d) x = -4 m(e) Need to know the value of the charge being


(e) Need to know the value of the charge being brought from infinity.

Two charges are fixed on the x-axis: Q1 = -4 μC is

Clicker Question 19: Two charges are fixed on the x axis: Q1 4 μC is located at x = 0, and Q2 = +9 μC is located at x = 5 m. A third charge will be brought onto the x-axis from infinity To which of the following points on thefrom infinity. To which of the following points on the x-axis could we bring that charge without doing any net work?



Two 5 μC charges are placed at ( 3 0) and (3 0) asTwo 5 μC charges are placed at (-3, 0) and (3, 0) as shown. The grid spacing is in meters. What is the work done by the electric force when a +1 μCcharge is moved along the y axis from A to C?charge is moved along the y axis from A to C?

(a) -2.70 × 10-2 J(a) 2.70 10 J(b) -1.20 × 10-2 J(c) 0(d) +1.20 × 10-2 J(e) +2.70 × 10-2 J


Clicker Question 20: Two 5 μC charges are placed at (-3, 0) and (3, 0) as

shown. The grid spacing is in meters. What is the work done by the electric force when a +1 μCcharge is moved along the y axis from A to C?


What is the magnitude of the current I ? Assume R


What is the magnitude of the current I2? Assume R1= 1, R2 = 2, R3 = 3, 1 = 15 V and 2 = 9 V.

a) 200 mAb) 500 mAc) 1 Ad) 2 Ae) 3 Ae) 3 A


What is the magnitude of the current I2? Assume R1 = 1, R2 = 2 R 3 15 V d 9 V


2, R3 = 3, 1 = 15 V and 2 = 9 V.


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AdfTdAgenda for Today - U of T Physicsameyerth/phy132s17/Jam...Clicker Question 11: The figure shows three identical lightbulbs connected to a battery having a constant voltage across