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#1 Class Class 12 Physics Electric Charges and Fields 2025 Short 3M

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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#2 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#3 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#4 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#5 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#6 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#7 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#8 Class Class 12 Physics Electric Charges and Fields 2025 Short 2M

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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#9 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#10 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#11 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#12 Class Class 12 Physics Electric Charges and Fields 2025 Short 3M

(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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#13 Class Class 12 Physics Electric Charges and Fields 2025 Short 3M

(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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#14 Class Class 12 Physics Electric Charges and Fields 2025 Short 3M

(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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#15 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#16 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

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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#17 Class Class 12 Physics Electric Charges and Fields 2025 Mcq 1M

A conducting wire connects two charged metallic spheres A and B of radii r$_{1}$ and r$_{2}$ respectively. The distance between the spheres is very large compared to their radii. The ratio of electric fields, (EA/EB) ...

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#18 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M

A thin plastic rod is bent into a circular ring of radius $R$. It is uniformly charged with linear charge density $\lambda$. The magnitude of the electric field at its centre is:

A. $\dfrac{\lambda}{2\varepsilon_0 R}$

B. Zero

C. $\dfrac{\lambda}{4\pi\varepsilon_0 R}$

D. $\dfrac{\lambda}{4\varepsilon_0 R}$

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#19 Class Class 12 Physics Electric Charges and Fields 2024 Long 1M

[Case Study, Q30 contd.] (iv)(a) A molecule of dipole moment $3.0\times10^{-30}$ C·m is placed in a uniform electric field of $2\times10^4\ NC^{-1}$. Find the maximum torque experienced by this molecule. OR (b) An ele...

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#20 Class Class 12 Physics Electric Charges and Fields 2024 Long 1M

[Case Study, Q30 contd.] (iii) Two identical short electric dipoles, each of dipole moment $\vec p$, are arranged perpendicular to each other such that their negative charges coincide. Find the magnitude of the net di...

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