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10. We fix two positive point charges •-•-•

of magnitude Q and 2Q on the two    Q    2Q

ends of a section. Then we first try to place a positive q charge

somewhere on the section so that it is in equilibrium. After that (removing the q charge) we try to place a -q charge on the section such that it is also in equilibrium. What can we say about the two equilibriums?

A)    The two eąuilibriums are at the same position.

B)    The two eąuilibriums are not at the same position.

C)    Only the q charge can be placed so that it is in eąuilibrium.

D)    Only the -q charge can be placed so that it is in eąuilibrium.

2 points

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11. A thick concrete column of height h and mass m falls over. How much does its potential energy change compared to its initial State after it comes to rest on the ground?

A)    AE<mgh/2

B)    AE= mgh/2

C)    AE> mgh/2

2 points

12. A point charge is moving in vacuum in a homogeneous magnetic field in a piane perpendicular to the lines of magnetic induction. Which ąuantity will be constant?

A)    The vector of velocity.

B)    The vector of acceleration.

C)    Both ąuantities will be constant.

D)    Neither of the two will be constant.

irasbeli vizsga 1112

6/16

2 points

2012. majus 17.