QUESTION 1: In the picture below, the two wires carry current i 1 and i 2 , resp
ID: 1335862 • Letter: Q
Question
QUESTION 1: In the picture below, the two wires carry current i1 and i2, respectively, with positive current to the right. The charge q is positive and has velocity v to the right. (It is midway between the two wires, as shown) ("North" is up the page, "East" is right, and so on.)
For the statements below, select T-True, F-False. If the first is T and the rest F, enter TFFFF.
A) If i1 = i2, then the wires repel each other.
B) If i1 is greater than i2, then the force on q is north.
C) If i1 = - i2, then the force on q is zero.
D) If i1 = 0 and i2 is greater than zero, then the magnetic field near charge q points into the page.
E) If v = 0, then the force on q is zero.
F) If i1 = 0 and i2 is greater than zero, then the force on q is south.
QUESTION 2) Consider the behavior of the circuit shown in the figure, when various values increase or decrease
(Select I-increases, D-decreases, If the first is I and the rest D, enter IDDDDD).
A) If R1 decreases, the current through R3 ______.
B) If the voltage V increases, the total current from the battery ______.
C) If R1 decreases, the current through R6 _______.
D) If R6 increases, the power output from the battery ______.
E) If R3 increases, the current through R5 ______.
F) If R3 decreases, the current from the battery______
Explanation / Answer
Solution:
F T F F T F
A) False; Only if I1= -I2 , the force on top wire is North and that on the bottom wire is south.
B ) True; If I1>I2 , the field at the location of charge q points INTO the page .So F is north.
C) False ; They repel if I1= - I2
D) False When I1<I2 the field at the location of q points out of the page and F is to the right.
E) True ; Since magnetic field acts on moving charges only.
F) False ; when I1<I2 the field at the location of q points out of the page and F is to the right.
2)
A) Increases. As Resistance decreases, the current thruough the circuit decreases.
B) Increases.
C) Increases
D)Decreases. ;From ohms law, V = I R
E) Decreases
F) Increases.
All the above are based on the analysis of Ohm's law .