1. Electric charges of the same sign A) also have the same magnitude. D) exert n
ID: 1615151 • Letter: 1
Question
1.
Electric charges of the same sign
A)
also have the same magnitude.
D)
exert no forces on each other.
B)
attract each other.
E)
None of these is correct.
C)
repel each other.
2.
Protons
A)
are about 2000 times more massive than electrons.
B)
are about 2000 times less massive than electrons.
C)
have 2000 times the charge of electrons.
D)
have 1/2000 the charge of electrons.
E)
can have any amount of charge.
5.
Electrical conductors contain
A)
only free electrons.
D)
neither bound nor free electrons.
B)
only bound electrons.
E)
only protons and neutrons.
C)
both free and bound electrons.
The SI unit of magnetic field is the tesla (T). This is equivalent to
A) N · s/(C · m) B) N · C/(s · m) C) N · m/s2 D) C/(A · s) E) None of these is correct.
1.
Electric charges of the same sign
A)
also have the same magnitude.
D)
exert no forces on each other.
B)
attract each other.
E)
None of these is correct.
C)
repel each other.
Explanation / Answer
1) C
2) A
Mass of proton, M= 1.674&10^-27kg
Mass of electron , m=9.1*10^-31kg
M/m= 1840.66 which is nearly 2000.
3) C
An electric conductor has large number of free electrons and a small number of bound electrons
4) A.
Magnetic force on a charge , F=Bqv
It implies, B= F/qv .
Substituting the units of various quantities on Right Hand Side of above equation, we get the required result.
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