NEET 2022 Phase 1 | Current Electricity Question 19 | Physics

A copper wire of length 10 m and radius $$\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$$ m has electrical resistance of 10 $$\Omega$$. The current density in the wire for an electric field strength of 10 (V/m) is

10⁴ A/m²

10⁶ A/m²

10^$$-$$5 A/m²

10⁵ A/m²

NEET 2022 Phase 1

MCQ (Single Correct Answer)

-1

A capacitor of capacitance C = 900 pF is charged fully by 100 V battery B as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance C = 900 pF as shown in figure (b). The electrostatic energy stored by the system (b) is

NEET 2022 Phase 1 Physics - Current Electricity Question 21 English

4.5 $$\times$$ 10^$$-$$6 J

3.25 $$\times$$ 10^$$-$$6 J

2.25 $$\times$$ 10^$$-$$6 J

1.5 $$\times$$ 10^$$-$$6 J

NEET 2022 Phase 1

MCQ (Single Correct Answer)

-1

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

NEET 2022 Phase 1 Physics - Current Electricity Question 20 English

Should be approximately equal to 2X

Should be approximately equal and are small

Should be very large and unequal

Do not play any significant role

NEET 2021

MCQ (Single Correct Answer)

-1

A parallel plate capacitor has a uniform electric field $$\overrightarrow E $$ in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is : ($$\varepsilon $$₀ = permittivity of free space)

$${{{E^2}Ad} \over {{\varepsilon _0}}}$$

$${1 \over 2}{\varepsilon _0}{E^2}$$

$${\varepsilon _0}EAd$$

$${1 \over 2}{\varepsilon _0}{E^2}Ad$$

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