1
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two charges of equal magnitude '$$q$$' are placed in air at a distance '$$2 r$$' apart and third charge '$$-2 \mathrm{q}$$' is placed at mid point. The potential energy of the system is $$\left(\varepsilon_0=\right.$$ permittivity of free space)

A
$$-\frac{q^2}{8 \pi \varepsilon_0 r}$$
B
$$-\frac{3 \mathrm{q}^2}{8 \pi \varepsilon_0 \mathrm{r}}$$
C
$$-\frac{5 q^2}{8 \pi \varepsilon_0 r}$$
D
$$-\frac{7 q^2}{8 \pi \varepsilon_0 r}$$
2
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron moving with velocity $$1.6 \times 10^7 \mathrm{~m} / \mathrm{s}$$ has wavelength of $$0.4 \mathop A\limits^o$$. The required accelerating voltage for the electron motion is [charge on electron $$=1.6 \times 10^{-19} \mathrm{C}$$, mass of electron $$=9 \times 10^{-31} \mathrm{~kg}$$ ]

A
$$7.2 \times 10^3 \mathrm{~V}$$
B
$$7.2 \times 10^2 \mathrm{~V}$$
C
$$7.2 \mathrm{~V}$$
D
$$7.2 \times 10^{-2} \mathrm{~V}$$
3
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Three point charges $$+\mathrm{q},+2 \mathrm{q}$$ and $$+\mathrm{Q}$$ are placed at the three vertices of an equilateral triangle. If the potential energy of the system of three charges is zero, the value of $$Q$$ in terms of $$q$$ is

A
$$\mathrm{Q}=-\frac{2 \mathrm{q}}{3}$$
B
$$Q=-\frac{1}{3} q$$
C
$$\mathrm{Q}=\frac{3 \mathrm{q}}{2}$$
D
$$Q=\frac{q}{2}$$
4
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The bob of a simple pendulum of length '$$L$$' has a mass '$$\mathrm{m}$$' and charge '$$\mathrm{q}$$'. The pendulum is suspended between the plates of a charged parallel plate capacitor. The direction of electric field is shown in figure. The period of oscillations of the simple pendulum is (acceleration due to gravity $$\mathrm{g}>\mathrm{qE} / \mathrm{m}$$ )

MHT CET 2023 11th May Morning Shift Physics - Electrostatics Question 81 English

A
$$2 \pi \sqrt{\frac{\mathrm{L}}{\mathrm{g}}}$$
B
$$2 \pi\left[\frac{\mathrm{L}}{\frac{\mathrm{qE}}{\mathrm{m}}-\mathrm{g}}\right]^{\frac{1}{2}}$$
C
$$2 \pi\left[\frac{\mathrm{L}}{\mathrm{g}-\frac{\mathrm{qE}}{\mathrm{m}}}\right]^{\frac{1}{2}}$$
D
$$2 \pi\left[\frac{\mathrm{L}}{\mathrm{g}+\frac{\mathrm{qE}}{\mathrm{m}}}\right]^{\frac{1}{2}}$$
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