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1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The magnitude of point charge due to which the electric field 30 cm away has the magnitude $2 \mathrm{NC}^{-1}$ will be
A
$2 \times 10^{-11} \mathrm{C}$
B
$3 \times 10^{-11} \mathrm{C}$
C
$5 \times 10^{-11} \mathrm{C}$
D
$9 \times 10^{-11} \mathrm{C}$
2
KCET 2018
MCQ (Single Correct Answer)
+1
-0
A mass of 1 kg carrying a charge of 2 C is accelerated through a potential of 1 V . The velocity acquired by it is
A
$\sqrt{2} \mathrm{~ms}^{-1}$
B
$2 \mathrm{~ms}^{-1}$
C
$\frac{1}{\sqrt{2}} \mathrm{~ms}^{-1}$
D
$\frac{1}{2} \mathrm{~ms}^{-1}$
3
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The force of repulsion between two identical positive charges when kept with a separation $r$ in air is $F$. Half the gap between the two charges is filled by a dielectric slab of dielectric constant $=4$. Then, the new force of repulsion between those two charges becomes
A
$\frac{F}{3}$
B
$\frac{F}{2}$
C
$\frac{F}{4}$
D
$\frac{4 F}{9}$
4
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The work done to move a charge on an equipotential surface is
A
infinity
B
less than 1
C
greater than 1
D
zero
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