Time Asymmetry Re-Visited

Jun 17th, 2015
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Abstract: Time does not feature in the equations describing the world of elementary particles and in some border astrophysical conditions. There, there is time symmetry. The world of the macro, on the other hand, is time asymmetric.

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PAPER -20031.A particle of mass M and charge Q moving with velocity v describes a circular path of radiusR when subjected to a uniform transverse magnetic field of induction B. The work done bythe field when the particle completes one full circle is Mv 2 (A) (B) zero 2R R (C) BQ2R(D) BQv2R1.B.Since the particle completes one full circle, therefore displacement of particle = 0Work done = force displacement = 02.A particle of charge 16 1018 coulomb moving with velocity 10 ms1 along the x-axisenters a region where a magnetic field of induction B is along the y axis, and an electricfield of induction B is along the y-axis, and an electric field of magnitude 104 V/m is along thenegative z-axis. If the charged particle continues moving along the x-axis, the magnitude ofB is(A) 103 Wb/m2(B) 105 Wb/m2162(C) 10 Wb/m(D) 103 Wb/m22.A.(1)F q(E v B)The solution of this problem can be obtained by resolving the motion along the threecoordinate axes namelyFqax x (Ex v yBz v zBy )m mFy qay (E y v zB x v xBz )m mFqaz z (Ez v xBy v yBz )m mFor the given problem,Ex Ey 0, v y v z 0 and B x B z 0Substituting in equation (2), we geta x a z 0 and ay Ey v xBzIf the particle passes through the region undeflected ay is also zero, thenE y v xB z Bz Eyvz10 4 103 Wb / m210

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