Question

1) Which of Maxwell's equations below predicts an induced magnetic field due to changes in an electric field? A) #Edi = 9 B) B. dA= 0 D$B.ds = Hole + Hope E) All of them 2) In the figure, two parallel wires carry currents of magnitude / as shown. The current is decreasing with time. A rectangular loon is midway between the wires. What is the direction of the net magnetic field in the region between the wires and that of the induced current in the loop? Magnetic field is out of the page; induced current is clockwise. B) Magnetic field is out of the page; induced current is counterclockwise. C) Magnetic field is zero; there is no induced current. D) Magnetic field is into the page; induced current is clockwise. E) Magnetic field is into the page; induced current is counterclockwise. 3) The two conducting rings shown are concentric, carry the same value MONIRT Bool! - current and the outer a counterclockwise current. What is the direction of the magnetic field due to both rings at their center? A) There is no field at the center. B) +z-direction C)-z-direction D) +x-direction 28 immer - - E) -x-direction outer 12 6/c R out ours it's roller ZB ASR2 4) The figure shows a bar magnet moving vertically downward toward a horizontal coil inducing in it an electric current clockwise as viewed from above. What are the correct polarities of the magnet? A) X is a south pole, Y is a north pole. B) X is a north pole, Y is a south pole. C) Both X and Y are south poles. D) Both X and Y are north poles. E) The polarities of the magnet cannot be determined from the information given.

Answer 1

1) maxwell's equation of induced magnetic field, & Bodsa Mole tuos doo de magnetic field is out of the page. It can be predected from right hand thumb sule, with thumbpointing in direction of curent. As current is decreasing magnetic field lines are decreasing, so to maintain it current is induced in anticlockwise direction, so option (B) is correct

magnetic field due to inner circle is in -Yaxis, magnetic field due to outer circle is in tZ axis. so net magnetic field is in az axis as strength of magnetic field due to inner circle is more because of Smaller radius! as B & Mo I 2R. magnetic field due to cwil is inside loop ie uper part is south pole to oppose the south pole of bar hew 21 X Y is Sruth is north and so option A is correct