In the picture below, the two wires carry current i_1 and i_2, respectively, wit

Question

In the picture below, the two wires carry current i_1 and i_2, respectively, with positive current to the right. The charge q is positive and has velocity v to the right. If v = 0, then the force on q is zero. If I_2 = - I_1 then the force on q equals zero. If i_1 = 0 and i_2 is greater than zero, then the force on q points out of the page. If i_1 = -i_2, then the wires repel each other. If i_2 = 0 and i_1 is greater than zero, then the force on q is north. If i_1 is less than i_2, then the force on q is south.. If I_1 = 0 and I_2 is greater than zero, then the magnetic field near charge q points into the page.

Explanation / Answer

a)   true

when v = 0

force on charge "q" is given as

F = q V B = 0       since v = 0

b) false

with the currents having equal magnitude and opposite direction , there will be net inward magnetic field on charge "q" and hence charge "q" will experience magnetic force

c) false

using right hand rule , the direction of magnetic force comes out to be downward for magnetic field coming out of the page

d) True

wires carrying current in opposite direction repel each other

e) True

using right hand rule,

f)

True

when i1 is less than i2 , net magnetic field is in outward direction and hence using right hand rule , magnetic force comes out to be in south direction

g)

False

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