Three point charges are placed at the corners of an equilateral triangle ABC as shown. The work done to put together these charges from infinity to their respective locations is

A moving hydrogen atom absorbs a photon of wavelength 221 nm and stops. If the mass of the hydrogen atom is \(1.67 \times 10^{-27} \text{ kg}\), the linear momentum of the photon will be: (Given: \(h = 6.63 \times 10^{-34} \text{ J}⋅­­s\))

Two identical capacitors are joined in parallel, charged to a potential V and then separated and connected in series, i.e., negative plate of first is connected to positive plate of second :

Which of the following statements is true about electromotive force (emf) of a cell?

Which of the following statements are true?
(A) Rheostat can be used both as a variable resistance and a potential divider.
(B) An electrical circuit is functional only if all the components of the circuit are connected in proper order, assuming that all circuit components/ devices are in working condition and key is closed.
(C) An open circuit means a break in some part of a circuit which could be deliberate such as a key in open position or a fault such as broken wire or burnt out component(s) or loose connection.
(D) Rheostat as a potential divider gives variable resistance.
Choose the correct answer from the options given below:

Read the following statements carefully:
(A) The average power in an inductor over one complete cycle is zero.
(B) Self-inductance plays the role of inertia.
(C) Mutual inductance of a pair of coils depends on their separation as well as their relative orientation.
(D) The capacitive reactance increases with increase in frequency of applied a. c.
Choose the correct answer from the options given below :

A convex lens has 20 cm focal length in air. Its focal length in water would be (Given : Refractive index of water = 1.33, refractive index for glass = 1.5)

If the matrix \(M=\left[\begin{array}{ccc}0 & -1 & 3 \alpha \\ 1 & \beta & -5 \\ -6 & 5 & 0\end{array}\right]\) is skew-symmetric, then

Which of the following compounds will give a pair of enantiomers upon nucleophilic substitution reaction with a hydroxide ion?

Identify the genetic disorder in which affected individual has a furrowed tongue, retarded mental development and broad palm?

If the area of the triangle with vertices A(x, 4), B(-2, 4) and C(2,-6) is 35 sq units, then the values of 2 are:

The solution set of \(6 \leq-3(2 x-4)<12, x \in R\) is :

Energy of a photon corresponding to a wavelength of 600 nm is 2.08 eV. The energy of a photon of wavelength 400 nm will be :