1 ) In bringing an electron toward another electron , electrostatic potential energy of system will : -
A ) increase , B ) decrease ,
C ) remain same , D ) None of these ,
Correct Answer : - A ) increase ,
V ∝ 1 / r .
So when distance decreases , electric potential will increases .
2 ) Some charge is given to conductor , their potential . . . . . . . . throughout the conductor .
A ) increase , B ) decreases ,
C ) remain same , D ) None of these ,
Correct Answer : - C ) remain same ,
3 ) Electric potential is . . . . . . . , when line joining has two equal and opposite charges .
A ) finite , B ) infinite ,
C ) zero , D ) None of these ,
Correct Answer : - C ) zero ,
When line joining has two equal and opposite charges e.g +2 q and -2 q . So , Electric potential will be zero .
4 ) Electric potential of earth is taken to be . . . . . . . . because earth is good conductor .
A ) finite , B ) infinite ,
C ) zero , D ) None of these ,
Correct Answer : - C ) zero ,
5 ) Equal charges are given to two spheres of different radii . The potential will be more on : - smaller sphere .
V = kq / r .
So , V ∝ 1 / r .
6 ) The electric potential at the surface of an atomic nucleus ( z = 50 ) of radius 9 x 10 ^ ( - 15 ) m is : -
A ) 4 x 10 ^ 3 Volt , B ) 8 x 10 ^ 6 Volt ,
C ) 18 x 10 ^ 7 Volt , D ) None of these ,
Correct Answer : - B ) 8 x 10 ^ 6 Volt ,
Solution : -
Formula : -
V = w / q = k q / r . . . . . . . . . . . eq. 1
So , q = z e = 50 x 1.6 x 10 ^ ( - 19 ) .
and k = 9 x 10 ^ 9 .
So , put in Equation 1 : -
V = ( 9 x 10 ^ 9 x 50 x 1.6 x 10 ^ ( - 19 ) ) / ( 9 x 10 ^ ( - 15 ) ) .
V = 8 x 10 ^ 6 Volt , Answer .
Now go to online quiz section and Physics Quiz 13 is uploaded related to these mcqs , so check your preparation by this link : -
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