NEET 2022 Phase 1 | Current Electricity Question 21 | Physics

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)

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

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

$${\varepsilon _0}EAd$$

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

NEET 2021

MCQ (Single Correct Answer)

-1

A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by

V = V₀sin$$\omega$$t

The displacement current between the plates of the capacitor, would then be given by :

$${I_d} = {V_0}\omega C\sin \omega t$$

$${I_d} = {V_0}\omega C\cos \omega t$$

$${I_d} = {{{V_0}} \over {\omega C}}\cos \omega t$$

$${I_d} = {{{V_0}} \over {\omega C}}\sin \omega t$$

NEET 2021

MCQ (Single Correct Answer)

-1

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

62 cm

60 cm

21.6 cm

64 cm

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