JEE Main 2021 (Online) 27th July Evening Shift | Capacitor Question 40 | Physics

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

Match List I with List II.

	List - I		List - II
(a)	Capacitance, C	(i)	$${M^1}{L^1}{T^{ - 3}}{A^{ - 1}}$$
(b)	Permittivity of free space, $${\varepsilon _0}$$	(ii)	$${M^{ - 1}}{L^{ - 3}}{T^4}{A^2}$$
(c)	Permeability of free space, $${\mu _0}$$	(iii)	$${M^{ - 1}}{L^{ - 2}}{T^4}{A^2}$$
(d)	Electric field, E	(iv)	$${M^1}{L^1}{T^{ - 2}}{A^{ - 2}}$$

Choose the correct answer from the options given below

(a) $$\to$$ (iii), (b) $$\to$$ (ii), (c) $$\to$$ (iv), (d) $$\to$$ (i)

(a) $$\to$$ (iii), (b) $$\to$$ (iv), (c) $$\to$$ (ii), (d) $$\to$$ (i)

(a) $$\to$$ (iv), (b) $$\to$$ (ii), (c) $$\to$$ (iii), (d) $$\to$$ (i)

(a) $$\to$$ (iv), (b) $$\to$$ (iii), (c) $$\to$$ (ii), (d) $$\to$$ (i)

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

JEE Main 2021 (Online) 27th July Morning Shift Physics - Capacitor Question 42 English

A capacitor of capacitance C = 1 $$\mu$$F is suddenly connected to a battery of 100 volt through a resistance R = 100 $$\Omega$$. The time taken for the capacitor to be charged to get 50 V is :

[Take ln 2 = 0.69]

1.44 $$\times$$ 10^$$-$$4 s

3.33 $$\times$$ 10^$$-$$4 s

0.69 $$\times$$ 10^$$-$$4 s

0.30 $$\times$$ 10^$$-$$4 s

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

In the reported figure, a capacitor is formed by placing a compound dielectric between the plates of parallel plate capacitor. The expression for the capacity of the said capacitor will be :

(Given area of plate = A)

JEE Main 2021 (Online) 27th July Morning Shift Physics - Capacitor Question 43 English

JEE Main 2021 (Online) 27th July Morning Shift Physics - Capacitor Question 43 English

$${{15} \over {34}}{{K{\varepsilon _0}A} \over d}$$

$${{15} \over 6}{{K{\varepsilon _0}A} \over d}$$

$${{25} \over 6}{{K{\varepsilon _0}A} \over d}$$

$${9 \over 6}{{K{\varepsilon _0}A} \over d}$$

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

Two capacitors of capacities 2C and C are joined in parallel and charged up to potential V. The battery is removed and the capacitor of capacity C is filled completely with a medium of dielectric constant K. The potential difference across the capacitors will now be :

$${V \over {K + 2}}$$

$${V \over K}$$

$${{3V} \over {K + 2}}$$

$${{3V} \over K}$$

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