1
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Three charges $$-\mathrm{q}, \mathrm{Q}$$ and $$-\mathrm{q}$$ are placed at equal distances on a straight line. If the total potential energy of the system of three charges is zero then the ratio $$\frac{Q}{q}$$ is

A
$$1: 2$$
B
$$1: 1$$
C
$$1: 4$$
D
$$1: 3$$
2
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two point charges $$+3 \mu \mathrm{C}$$ and $$+8 \mu \mathrm{C}$$ repel each other with a force of $$40 \mathrm{~N}$$. If a charge of $$-5 \mu \mathrm{C}$$ is added to each of them, then force between them will become

A
$$-$$10 N
B
10 N
C
20 N
D
$$-$$20 N
3
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

In hydrogen atom an electron revolves around a proton (in nucleus) at a distance 'r' m. the intensity of electric field due to the proton at distance 'r' is $$5 \times 10^{11} \mathrm{NC}^{-1}$$, the magnitude of force between the electron and proton is [charge on electron $$=1.6 \times 10^{-19} \mathrm{C}$$]

A
$$4 \times 10^8 \mathrm{~N}$$
B
$$8 \times 10^8 \mathrm{~N}$$
C
$$4 \times 10^{-8} \mathrm{~N}$$
D
$$8 \times 10^{-8} \mathrm{~N}$$
4
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two charged metallic spheres are joined by a very thin metal wire. If the radius of the larger sphere is four times that of the smaller sphere, the electric field near the larger sphere is

A
twice that near the smaller sphere
B
quarter of that near the smaller sphere
C
same as that near the smaller sphere
D
half of that near smaller sphere
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