Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2019
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06riQ1



Sections 30882, 30883 results

0- 6 :
7-12 :	***** [low = 9]
13-18 :	********
19-24 :	************** [mean = 21.4 +/- 5.5]
25-30 :	*********** [high = 30]

Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2018
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06Av3g


Sections 30882, 30883 results

0- 6 :	* [low = 6]
7-12 :
13-18 :	************
19-24 :	******************* [mean = 20.1 +/- 4.2]
25-30 :	** [high = 27]

Physics quiz question: higher potential end of moving rod

Physics 205B Quiz 6, spring semester 2013
Cuesta College, San Luis Obispo, CA

A conducting rod moves at a constant speed through a uniform magnetic field. The __________ of this rod is at a higher potential.
(A) top.
(B) bottom.
(C) middle.
(D) (None of the above choices, as the entire rod has the same potential.)

Correct answer (highlight to unhide): (D)

Since the angle between the magnetic field and direction of the velocity of the (fictitious) positive (and negative) charges in the rod is 180°, then there is no force exerted on the charges in the rod (as the magnitude of the force depends on the sine of this angle), so no charges are displaced to either end of the rod, and thus there is no potential difference between either end.

Section 30882
Exam code: quiz06h4cK
(A) : 11 students
(B) : 5 students
(C) : 2 students
(D) : 14 students

Success level: 44%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.75

Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2017
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06LnDr


Sections 30882, 30883 results

0- 6 :
7-12 :
13-18 :	******** [low = 15]
19-24 :	************** [mean = 21.8 +/- 4.1]
25-30 :	******* [high = 30]

Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2016
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06eL3k



Sections 30882, 30883 results

0- 6 :	*   [low = 6]
7-12 :	*****
13-18 :	*********************   [mean = 17.0 +/- 5.1]
19-24 :	**********
25-30 :	*   [high = 27]

Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2015
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06t3SL



Sections 30882, 30883 results

0- 6 :	**   [low = 3]
7-12 :	*********
13-18 :	***************   [mean = 17.8 +/- 6.2]
19-24 :	****************
25-30 :	****   [high = 30]

Physics quiz archive: magnetism, induction

Physics 205B Quiz 6, spring semester 2014
Cuesta College, San Luis Obispo, CA
Sections 30882, 30883, version 1
Exam code: quiz06Lp4s



Sections 30882, 30883 results

0- 6 :	* [low = 6]
7-12 :	******
13-18 :	**************** [mean = 17.8 +/- 5.4]
19-24 :	***********
25-30 :	** [high = 30]

Physics quiz question: direction of moving rod

Physics 205B Quiz 6, spring semester 2012
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Problem 20.1

A conducting rod moves at a constant speed through a uniform magnetic field. The top end of the rod is at a higher potential than the bottom end, while the rod is moving:
(A) up ↑.
(B) down ↓.
(C) left ←.
(D) right →.
(E) into the page ⊗.
(F) out of the page ⊙.
(G) (More than one of these choices is possible.)

Correct answer (highlight to unhide): (F)

With the magnetic force pointing up in the plane of this page, and magnetic field lines pointing to the right in the plane of this page, from applying the appropriate right hand rule, velocity of the rod must be coming out of the page.

Section 30882
Exam code: quiz06LR1r
(A) : 4 students
(B) : 0 students
(C) : 0 students
(D) : 3 students
(E) : 3 students
(F) : 17 students
(G) : 0 students

Success level: 63%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.88