Consider the arrangrment shown in the figure. A conducting bar (labeled 12 in th

Question

Consider the arrangrment shown in the figure. A conducting bar (labeled 12 in the figure) moves along the r-direction at constant speed. The bar is supported by frictionless conducting rails A usifors magnetic field is present on the y- z plane hat makes an angle t with the y-axds as shown Which of the following statement t. A No current is induced B. Indaced current is in the bar Dows C) Induced current in the bar fhows in D, Induced current in the bar Bows in the +y direction E Induced current in the bar flows in the -y direction 2. The figure shows four different sets of insulated wires that cross each other at right angles without actually making electrical contact. The magnitude of the current is the same in all the wires, and the directions of current flow are as indicated For which (if any) conguration wil the magnetk teld at the center of square fermed by the wires be equal to zero? E Cannot be determined speed ef electromagnetic waves in vacuum is the same for all waves regardless of wavelength depends on the wavelength C depends on the frequency D. is the same as the speed of sound E. depends on the electric field and magnetic field of the EM wave the current in the long straight wire is h 50A and the wire

Explanation / Answer

1.(C)the induced current will flow in the +x direction.

We know that the movement of bar will cause a change in magnetic flux which will appose the change due to which it is produced.

2.(C)C

We know with the help of right hand rule the magnetic field directs along the curved fingers. For figure C the upper and lower wires will have B field in ouwards while for those in left and right will be inwards and thus produces zero field at the center.

3.(A)is the same for all the waves regardless of wavelength.

We know that the electromagnetic waves travels with speed equal to c = 3 x 10^8 m/s.

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