Multiple Choice
Two very long parallel wires in the xy-plane,a distance 2a apart,are parallel to the y-axis and carry equal currents I as shown in the figure.The +z direction points perpendicular to the xy-plane in a right-handed coordinate system.If the left current flows in the +y direction and the right current flows in the -y direction,which one of the graphs shown in the figure below best represents the z component of the net magnetic field,in the xy-plane,as a function of x? (Caution: These graphs are not magnetic field lines.) 
A) 1
B) 2
C) 3
D) 4
E) 5
Correct Answer:
Verified
Correct Answer:
Verified
Q19: Light of wavelength 633 nm from a
Q21: The electric field 1.5 cm from a
Q26: If the torque on an object adds
Q34: The current in a wire varies with
Q37: When a potential difference of 10 V
Q40: A double-concave lens has equal radii of
Q45: Consider a uniform solid sphere of radius
Q50: The voltage and power ratings of a
Q1346: As shown in the figure,two long straight
Q1351: An optical system comprises in turn,from left