3. A long straight conductor has uniform cross-section in the shape of two identical overlapped circles with centre-to-centre spacing a. Material from overlapped section has been removed from entire length of the conductor and portions to the right and to the left of the y-z plane are insulated from each other. These portions carry uniform currents of current density J in the positive and negative z-directions respectively. Permeability of both the conductors is the same as that of vacuum. Which of the following statements best describes magnetic field in the empty space inside the composite conductor. (a) It is nonuniform and points in the positive y-direction everywhere on the y-axis. (b) It is nonuniform and points in the positive y-direction everywhere on the x and y-axes. (c)t'is uniform, points everywhere in the positive y-direction and has magnitude 4,Ja . (d)It has different directions at different points but the same magnitude H, Ja.
3. A long straight conductor has uniform cross-section in the shape of two identical overlapped circles with centre-to-centre spacing a. Material from overlapped section has been removed from entire length of the conductor and portions to the right and to the left of the y-z plane are insulated from each other. These portions carry uniform currents of current density J in the positive and negative z-directions respectively. Permeability of both the conductors is the same as that of vacuum. Which of the following statements best describes magnetic field in the empty space inside the composite conductor. (a) It is nonuniform and points in the positive y-direction everywhere on the y-axis. (b) It is nonuniform and points in the positive y-direction everywhere on the x and y-axes. (c)t'is uniform, points everywhere in the positive y-direction and has magnitude 4,Ja . (d)It has different directions at different points but the same magnitude H, Ja.
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