1
MHT CET 2021 23rd September Evening Shift
+1
-0

Two positive ions, each carrying a charge 'q' are separated by a distance 'd'. If 'F' is the force of repulsion between the ions, the number of electrons from each ion will be ($$\varepsilon$$ = charge on $$\varepsilon_k$$ = permittivity of free space)

A
$$\sqrt{\frac{4 \pi \varepsilon_0 \mathrm{~d}^2}{\mathrm{e}^2}}$$
B
$$\sqrt{\frac{4 \pi \varepsilon_0 \mathrm{Fd}}{\mathrm{e}^2}}$$
C
$$\sqrt{\frac{4 \pi \varepsilon_0 F d^2}{\mathrm{e}}}$$
D
$$\sqrt{\frac{4 \pi \varepsilon_0 \mathrm{Fd}^2}{\mathrm{e}^2}}$$
2
MHT CET 2021 23rd September Evening Shift
+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
$$1: 3$$
3
MHT CET 2021 23rd September Evening Shift
+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
4
MHT CET 2021 23th September Morning Shift
+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
$$8 \times 10^{-8} \mathrm{~N}$$
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