A bar magnet is inserted in a region where there originally is a constant magnet

Question

A bar magnet is inserted in a region where there originally is a constant magnetic field directed down as shown by the four arrows. After the magnet is in place, the magnetic field at point P is zero. End A of the bar magnet must be a south pole of the magnet. a north pole of the magnet. an unmagnetized area of the magnet. positively charged negatively charged. A charged particle in a constant magnetic field is moving in a circle at speed v when a passing cosmic ray causes it to lose its charge. After that, it will move in the same circle. along.a straight line tangent to the circle. along a straight line perpendicular to the plane of the circle. along a helix that has the direction of the cosmic ray as its axis. in the same circle, but in the opposite direction. Current of equal magnitude l in the same direction is present in wires A and B. The force per unit length wire A exerts on wire B has magnitude and direction mu0l/2pia, upwards. mu0l2/2pia, upwards. mu0l/2pia, downwards. mu0l2/2pia, downwards. mu0l/2pia, into the page. The magnitude of the torque on a square loop of area A with current l in a constant magnetic field of magnitude B when the magnetic field is parallel to the plane of the loop is 0. BIAcos90 degree C BIAsin90 degree C. BIAcos180 degree C. BIAsin180 degree C.

Explanation / Answer

a.) north pole

b.) -- b

c.) -- b

d.) a---0

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