1
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-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

A
Should be approximately equal to 2X
B
Should be approximately equal and are small
C
Should be very large and unequal
D
Do not play any significant role
2
NEET 2021
MCQ (Single Correct Answer)
+4
-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)
A
$${{{E^2}Ad} \over {{\varepsilon _0}}}$$
B
$${1 \over 2}{\varepsilon _0}{E^2}$$
C
$${\varepsilon _0}EAd$$
D
$${1 \over 2}{\varepsilon _0}{E^2}Ad$$
3
NEET 2021
MCQ (Single Correct Answer)
+4
-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 :
A
$${I_d} = {V_0}\omega C\sin \omega t$$
B
$${I_d} = {V_0}\omega C\cos \omega t$$
C
$${I_d} = {{{V_0}} \over {\omega C}}\cos \omega t$$
D
$${I_d} = {{{V_0}} \over {\omega C}}\sin \omega t$$
4
NEET 2021
MCQ (Single Correct Answer)
+4
-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?
A
62 cm
B
60 cm
C
21.6 cm
D
64 cm
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Mechanics
Electricity
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