1. Two parallel straight wires carry currents in the same direction. The magneti
ID: 1561138 • Letter: 1
Question
1. Two parallel straight wires carry currents in the same direction. The magnetic forces between the wires are such that
A. the wires feel a clockwise torque.
B. they are pulled in the direction of the wires.
C. the wires repel each other.
D. the wires attract each other.
2. Magnetic field lines come out of the south pole of a magnet and enter at the north pole.
A. TRUE
B. FALSE
3. Two long, parallel bars carry equal currents in opposite directions. The magnetic fields due to these two currents cancel each other midway between the two bars.
A. TRUE
A. the wires feel a clockwise torque.
B. they are pulled in the direction of the wires.
C. the wires repel each other.
D. the wires attract each other.
2. Magnetic field lines come out of the south pole of a magnet and enter at the north pole.
A. TRUE
B. FALSE
3. Two long, parallel bars carry equal currents in opposite directions. The magnetic fields due to these two currents cancel each other midway between the two bars.
A. TRUE
B. FALSEExplanation / Answer
1) Once the magnetic field has been calculated, The direction is obtained from the right hand rule. Note that two wires carrying current in the same direction attract each other, and they repel if the currents are opposite in direction.
ANS:-
D. the wires attract each other.
2) Magnetic field lines do not go anywhere. Field lines are useful for visualizing vector fields. These are not physical that are actually present at certain locations. And the direction you are talking about is a convention. By convention, the field lines are taken to direct away from the N-pole and towards S-pole. Internally, these field lines complete a loop
ANS:- FALSE
3) Two long parallel straight wires carry equal current in opposite directions. At a point midway between the two wires, the magnetic field they generate is nonzero, and points perpendicular to the plane of the two wires
ANS :- FALSE
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