In the picture the two wires carry current i1 and i2, respectively, with positiv

Question

In the picture 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.

Select True or False for the following statements.

True False If i2 = 0 and i1 is greater than zero, then the magnetic field near charge q points out of the page.
True False If i1 = 0 and i2 is greater than zero, then the force on q points out of the page.
True False If v = 0, then the force on q is zero.
True False If i2 = 0 and i1 is greater than zero, then the force on q is to the top of the page.
True False If i1 is greater than i2, then the force on q is to the top of the page.

In the picture 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. Select True or False for the following statements. True False If i2 = 0 and i1 is greater than zero, then the magnetic field near charge q points out of the page. True False If i1 = 0 and i2 is greater than zero, then the force on q points out of the page. True False If v = 0, then the force on q is zero. True False If i2 = 0 and i1 is greater than zero, then the force on q is to the top of the page. True False If i1 is greater than i2, then the force on q is to the top of the page.

Explanation / Answer

Question 1)

If I2 = 0, then by the right hand rule for the current I1 the magnetic field near charge q will point into the page. Question 1 is False

Question 2)

If I1 is zero, the magnetic field near charge q from I2 points out of the page, and by the right hand rule, the force on the charge will be downward. Question 2 is False

Question 3)

The formula for force on a charge is F = qvB. If v = 0, then multiplying anthing times zero still give zero, so force is zero. Question 3 is True

Question 4)

If I2 is zero, the magnetic field near point q from I1 will point into the page, and by the right hand rule the force on the charge will be directed upward. Question 4 is True.

Question 5)

If I1 is greater then I2, the net magnetic field will point into the page near charge q. By the right hand rule, the force on the charge will be directed upward. Question 5 is True.

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