Sci-Fi

Its a basic Physics law that mass can neither be created nor destroyed.But the BBT(Big Bang Theory) defies this law.Big Bang created mass and as a result we are here.That means Big Bang defies the very basic law of Physics.So one thing has to be incorrect.Either the BBT or the basic law of Physics!Thats what confuses me. What do you guys think?

Magnetic field due to a circular loop,i know the equation to find Magnetic field on axial lines but here direction of motion makes an angle of 30 degs with the axis.If you know the equation for that please tell me. And i know the equation for Lorentz force = q(V x B)+ qE.

I have one question,that i can't find a solution to.So if someone can help,i ll be really grateful! Q-A Circular loop of radius 20 cm carries a current 10 A.An electron crosses the plane of the loop with a speed of 2.0 x 10^6 m/s (2 into 10 to the power 6 meters/second).The direction of motion makes an angle of 30 degrees with the axis of the circle and passes through its centre. What is the magnitude of the magnetic force on the electron at the instant it crosses the plane? Thanks in advance!