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#1 Class 12 Physics Electrostatic Potential and Capacitance 2025 Short 3M CBSE
Figure shows a narrow beam of electrons entering with a velocity of $3 \times 10^{7}$ m/s, symmetrically through the space between two parallel horizontal plates P$_{1}$ P$_{1}$' and P$_{2}$ P$_{2}$' kept 2 cm apart.
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#2 Class 12 Physics Electrostatic Potential and Capacitance 2025 Mcq 1M CBSE
In a region electric field is given by E = 4 x i N/C. The potential difference between points A (x = 1 m) and B (x = 3 m), (VA – VB) is
A. –16 V
B. 16 V
C. – 8 V
D. 8 V
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#3 Class 12 Physics Electrostatic Potential and Capacitance 2025 Short 3M CBSE
A parallel plate capacitor of capacitance C has a dielectric slab between its plates. It is charged to a potential difference V by connecting it across a battery. The battery is then disconnected. If the dielectric sl...
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#4 Class 12 Physics Electrostatic Potential and Capacitance 2025 Mcq 1M CBSE
In a region, the electric potential varies as V = 10 – 50x, where V is in volts and x in meters. The electric field in the region is
A. 10 N/C along +x
B. 10 N/C along –x
C. 50 N/C along +x
D. 50 N/C along –x
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#5 Class 12 Physics Electric Charges and Fields 2025 Short 3M CBSE
Two point charges q$_{1}$ = $2.5 \times 10^{-7}$ C and q$_{2}$ = – $2.5 \times 10^{-7}$ C are located at points (0, 0, – 15 cm) and (0, 0, 15 cm) respectively. Find : (a) the electric dipole moment of the system, and ...
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#6 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
The figure shows three point charges kept at the vertices of triangle ABC. The net electric field, due to this system of charges, at the midpoint M of base BC will be :
A. pointing along MA
B. pointing along AM
C. pointing along AM
D. Zero
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#7 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
A charged particle of mass m having kinetic energy K passes undeflected through a region with electric field E and magnetic field B acting perpendicular to each other. The mass m of the particle will be : KB2 2KB2 2KE...
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#8 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
An electron is moving with velocity v$_{0}$ î . If a uniform electric field E = E$_{0}$ ĵ is set up in the region, the electron will :
A. describe a circular path
B. describe a helical path
C. describe a parabolic path
D. continue moving without any deviation
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#9 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
Two point charges – Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be :
A. (i – j)
B. (– i – j)
C. (i – j)
D. (– i – j)
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#10 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
Two small identical metallic balls having charges q and – 2q are kept far at a separation r. They are brought in contact and then separated at distance . Compared to the initial force F, they will now :
A. attract with a force
B. repel with a force
C. repel with a force F
D. attract with a force F
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#11 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
Which of the following statements is true about mobility of charge carriers in a metal ?
A. Mobility increases with increase in applied electric field
B. Mobility decreases with increase in temperature
C. Mobility is independent of the mass of the charge carrier
D. Mobility increases with increase in temperature
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#12 Class 12 Physics Electric Charges and Fields 2025 Short 2M CBSE
An electric dipole consists of two point charges +1 C and −1 C, held 10 cm apart. It is subjected to a uniform electric field of 100 N/C. Calculate the amount of work done in turning the dipole from its position of st...
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#13 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
An electric dipole with dipole moment P = ($2.54 \times 10^{-28}$ C.m) (2.00 î + 3.00 j ) is placed in an electric field E = 1000 î . An external agent turns the dipole until its electric dipole moment is P = ($2.54...
A. $2.54 \times 10^{-25}$ J
B. $1.27 \times 10^{-24}$ J
C. $1.02 \times 10^{-23}$ J
D. $2.29 \times 10^{-26}$ J
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#14 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
An electric dipole P = 2qa î is placed in x-y plane, centred at the origin. Let E$_{1}$ and E$_{2}$ be the magnitudes of electric field at a point distant r (>> a) from its centre, along its axis and on its equatoria...
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#15 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
A particle of mass m and charge q starts from rest and moves in an electric field E = E$_{0}$ î . After travelling a distance x in the field along x-axis, the kinetic energy of the particle will be :
A. q E$_{0}$ x$_{2}$
B. q E$_{0}$ x
C. q$_{2}$ E$_{0}$ x
D. q 2 E$_{02}$ x
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#16 Class 12 Physics Electric Charges and Fields 2025 Short 3M CBSE
(i) An electric field E is maintained in a conductor of length L and area of cross-section A. Show that the electrons drift with an average velocity v d = Here symbols have their usual meanings. (ii) Electrons in meta...
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#17 Class 12 Physics Electric Charges and Fields 2025 Short 3M CBSE
(a) Draw electric field lines and equipotential surfaces for a system of two equal positive charges separated by some distance. 3 (b) Using the drawing in (a) above, explain that electric field need not be a constant ...
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#18 Class 12 Physics Electric Charges and Fields 2025 Short 3M CBSE
(i) Draw electric field lines and equipotential surfaces for a system of two equal and opposite point charges separated by some distance. 3 (ii) Why electric field E at a point on an equipotential surface must be perp...
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#19 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
Three point charges 2q, –2q and q are kept at the vertices of an equilateral triangle of side l. The potential energy of the system is 1 (A) zero (B)
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#20 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE
A current of 1.5 A is maintained in a copper wire of length 1 m with area of cross-section $1.7 \times 10^{-7}$ $m^2$. The magnitude of electric field in the wire is [Cu = $1.7 \times 10^{-8}$ m)
A. 0.15 m
B. 0.30 m
C. 1.5 m
D. 3.0 m
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