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Show that the potential representation (Eq. 12.133) automatically satisfies [Suggestion: Use Prob. 12.54.]

Short Answer

Expert verified

The potential representation is automatically satisfiedG渭谓xv=0

Step by step solution

01

Expression for the field tensor equation:

Using equation 12.130, write the equation for the field tensor.

F=Fx+Fx+Fx .........(1)

Itisalsoknowthat:x2=x=x=Also,thevalueofF渭谓,F渭位andF谓位isgivenby:F渭谓=A-AF渭位=A-AF谓渭=A-A

02

Show that :

AV=AV

SubstituteforX,forX,VforXV,AV-VAforF渭惫,VA--AVforF惫位andA-AFiinequation(1)F渭痴X2+F痴位X+F位渭XV=F渭痴+F痴位+VF位渭F渭痴X2+F痴位X+F位渭XV=AV-V础渭+VA-AV+VA-AF渭痴X2+F痴位X+F位渭XV=AV-VA+VA-AV+VA-VAOnfurthersolving,F渭痴X2+F痴位X+F位渭XV=AV-VA+VA-AV+VA-VAF渭痴X2+F痴位X+F位渭XV=A-A+-VA+A+A-AF渭痴X2+F痴位X+F位渭XV=0Hence,theaboveequationsatisfiesG渭谓x=0Therefore,thepotentialrepresentattionisautomaticallysatisfiedG渭谓x=0

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Most popular questions from this chapter

(a) Draw a space-time diagram representing a game of catch (or a conversation) between two people at rest, apart. How is it possible for them to communicate, given that their separation is spacelike?

(b) There's an old limerick that runs as follows:

There once was a girl named Ms. Bright,

Who could travel much faster than light.

She departed one day,

The Einsteinian way,

And returned on the previous night.

What do you think? Even if she could travel faster than light, could she return before she set out? Could she arrive at some intermediate destination before she set out? Draw a space-time diagram representing this trip.

A car is traveling along the line in S (Fig. 12.25), at (ordinary) speed2/5c .

(a) Find the components Ux and Uyof the (ordinary) velocity.

(b) Find the components xandyof the proper velocity.

(c) Find the zeroth component of the 4-velocity, 0.

System Sis moving in the x direction with (ordinary) speed ,2/5c relative to S. By using the appropriate transformation laws:

(d) Find the (ordinary) velocity components xandyin S.

(e) Find the proper velocity components xandyin S.

(f) As a consistency check, verify that

=u1-u2c2

(a) What鈥檚 the percent error introduced when you use Galileo鈥檚 rule, instead of Einstein鈥檚, withvAB=5mi/handvBC=60mi/hand?

(b) Suppose you could run at half the speed of light down the corridor of a train going three-quarters the speed of light. What would your speed be relative to the ground?

(c) Prove, using Eq. 12.3, that ifvAB<candvBC<cthenvAC<cInterpret this result.


A cop pulls you over and asks what speed you were going. 鈥淲ell, officer, I cannot tell a lie: the speedometer read 4108m/s.鈥 He gives you a ticket, because the speed limit on this highway is 2.5108m/s . In court, your lawyer (who, luckily, has studied physics) points out that a car鈥檚 speedometer measures proper velocity, whereas the speed limit is ordinary velocity. Guilty, or innocent?

A car is traveling along the 45 line in S (Fig. 12.25), at (ordinary) speed(2/5)c .

(a) Find the componentsux anduy of the (ordinary) velocity.

(b) Find the componentsrole="math" localid="1658247416805" x andy of the proper velocity.

(c) Find the zeroth component of the 4-velocity,0 .

SystemS is moving in the x direction with (ordinary) speed 2/5c, relative to S. By using the appropriate transformation laws:

(d) Find the (ordinary) velocity componentsux and uyin S.

(e) Find the proper velocity components x andy in S.

(f) As a consistency check, verify that

=u1-u2c2

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