Electrostatics Book Back Practice Test

12th Standard Physics — Electrostatics: Book Back Online Practice Test

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Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?

இரு -q மின்துகள்களுக்கு இடையில் உள்ள +q மின்துகள் மற்றும் அதன் இடப்பெயர்ச்சி திசைகள் A1, A2, B1, B2 காட்டப்பட்டுள்ளன.

A.A1 and A2 B.B1 and B2 C.both directions D.No stable

Which charge configuration produces a uniform electric field?

A.point charge B.uniformly charged infinite line C.uniformly charged infinite plane D.uniformly charged spherical shell

What is the ratio of the charges \(q_1 / q_2\) for the following electric field line pattern?

இரண்டு மின்துகள்களைச் சுற்றியுள்ள மின்புலக் கோடுகளின் வரைபடம்.

A.\(1/5\) B.\(25/11\) C.\(5\) D.\(11/25\)

An electric dipole is placed at an alignment angle of \(30^\circ\) with an electric field of \(2 \times 10^5 \text{ N C}^{-1}\). It experiences a torque equal to \(8 \text{ N m}\). The charge on the dipole if the dipole length is \(1 \text{ cm}\) is

A.\(4 \text{ mC}\) B.\(8 \text{ mC}\) C.\(5 \text{ mC}\) D.\(7 \text{ mC}\)

Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric flux through each Gaussian surface in increasing order.

மின்துகள்களை உள்ளடக்கிய நான்கு காஸியன் பரப்புகள் A, B, C, D காட்டப்பட்டுள்ளன.

A.\(D < C < B < A\) B.\(A < B = C < D\) C.\(C < A = B < D\) D.\(D > C > B > A\)

The total electric flux for the following closed surface which is kept inside water

நீருக்குள் வைக்கப்பட்டுள்ள மின்துகள்கள் மற்றும் மூடிய பரப்பு.

A.\(80q / \epsilon_0\) B.\(q / 40\epsilon_0\) C.\(q / 80\epsilon_0\) D.\(q / 160\epsilon_0\)

Two identical conducting balls having positive charges \(q_1\) and \(q_2\) are separated by a centre to centre distance \(r\). If they are made to touch each other and then separated to the same distance, the force between them will be

A.less than before B.same as before C.more than before D.zero

Rank the electrostatic potential energies for the given system of charges in increasing order.

நான்கு மின்துகள் அமைப்புகள் (a), (b), (c), (d) காட்டப்பட்டுள்ளன.

A.\(1 = 4 < 2 < 3\) B.\(2 = 4 < 3 < 1\) C.\(2 = 3 < 1 < 4\) D.\(3 < 1 < 2 < 4\)

An electric field \(\vec{E} = 10x \hat{i}\) exists in a certain region of space. Then the potential difference \(V = V_o - V_A\), where \(V_o\) is the potential at the origin and \(V_A\) is the potential at \(x = 2 \text{ m}\) is:

A.\(10 \text{ V}\) B.\(-20 \text{ V}\) C.\(+20 \text{ V}\) D.\(-10 \text{ V}\)

Q10

A thin conducting spherical shell of radius \(R\) has a charge \(Q\) which is uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is

கோளகக் கூட்டினால் ஏற்படும் மின்னழுத்தம் V க்கும் தொலைவு r க்கும் இடையேயான வரைபடங்கள்.

A.(a) B.(b) C.(c) D.(d)

Q11

Two points A and B are maintained at a potential of \(7 \text{ V}\) and \(-4 \text{ V}\) respectively. The work done in moving \(50\) electrons from A to B is

A.\(8.80 \times 10^{-17} \text{ J}\) B.\(-8.80 \times 10^{-17} \text{ J}\) C.\(4.40 \times 10^{-17} \text{ J}\) D.\(5.80 \times 10^{-17} \text{ J}\)

Q12

If voltage applied on a capacitor is increased from \(V\) to \(2V\), choose the correct conclusion.

A.\(Q\) remains the same, \(C\) is doubled B.\(Q\) is doubled, \(C\) doubled C.\(C\) remains same, \(Q\) doubled D.Both \(Q\) and \(C\) remain same

Q13

A parallel plate capacitor stores a charge \(Q\) at a voltage \(V\). Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?

A.Capacitance B.Charge C.Voltage D.Energy density

Q14

Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is

முக்கோண வடிவில் இணைக்கப்பட்ட மூன்று மின்தேக்கிகளின் மின்சுற்று.

A.\(1 \mu\text{F}\) B.\(2 \mu\text{F}\) C.\(3 \mu\text{F}\) D.\(14 \mu\text{F}\)

Q15

Two metallic spheres of radii \(1 \text{ cm}\) and \(3 \text{ cm}\) are given charges of \(-1 \times 10^{-2} \text{ C}\) and \(5 \times 10^{-2} \text{ C}\) respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

A.\(3 \times 10^{-2} \text{ C}\) B.\(4 \times 10^{-2} \text{ C}\) C.\(1 \times 10^{-2} \text{ C}\) D.\(2 \times 10^{-2} \text{ C}\)

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About this Electrostatics test

This free online practice test covers Electrostatics from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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