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What is considered one of the best methods for couples looking for parenthood, especially given the large number of orphaned and destitute children in India?
The NCERT highlights, 'Our laws permit legal adoption and it is as yet, one of the best methods for couples looking for parenthood.'
Embryos formed by in-vivo fertilisation can also be used for transfer. Which type of transfer would be appropriate for an embryo with more than 8 blastomeres formed this way into a female who cannot conceive?
The text states, 'Embryos formed by in-vivo fertilisation (fusion of gametes within the female) also could be used for such transfer to assist those females who cannot conceive.' And for embryos with more than 8 blastomeres, IUT (intra uterine transfer) is used.
Which of the following expressions correctly represents the magnetic energy stored in an inductor carrying current I?
According to the NCERT text, 'The energy required to build up the current I is, $W = \frac{1}{2}LI^2$ (6.17)'. This formula is derived from the work done against the back emf to establish the current in the inductor.
The work done against the back emf in establishing a current in an inductor is stored as:
The NCERT text states, 'work needs to be done against the back emf (ε) in establishing the current. This work done is stored as magnetic potential energy.'
In the context of energy stored in an inductor, the self-inductance (L) is analogous to which mechanical quantity?
The NCERT text mentions, 'This expression reminds us of $mv^2/2$ for the (mechanical) kinetic energy of a particle of mass m, and shows that L is analogous to m (i.e., L is electrical inertia and opposes growth and decay of current in the circuit).'
What is the magnetic energy stored per unit volume ($u_B$) in a solenoid in terms of the magnetic field B and permeability $\mu_0$?
Example 6.9 (b) in the NCERT text derives the magnetic energy per unit volume as, '$u_B = \frac{B^2}{2\mu_0}$ (6.18)'.
A comparison between electrostatic energy stored in a capacitor and magnetic energy stored in an inductor reveals that:
The NCERT text states, 'We have already obtained the relation for the electrostatic energy stored per unit volume in a parallel plate capacitor (refer to Chapter 2, Eq. 2.73), $u_E = \frac{1}{2} \epsilon_0 E^2$ (2.73). In both the cases energy is proportional to the square of the field strength.'
If the current flowing through an inductor is doubled, how does the energy stored in it change?
The energy stored in an inductor is given by $W = \frac{1}{2}LI^2$. If the current I is doubled to 2I, the new energy $W' = \frac{1}{2}L(2I)^2 = \frac{1}{2}L(4I^2) = 4 (\frac{1}{2}LI^2) = 4W$. Thus, the energy becomes four times.
What is the SI unit of inductance (L)?
The NCERT text mentions, 'The SI unit of inductance is henry and is denoted by H. It is named in honour of Joseph Henry who discovered electromagnetic induction in USA, independently of Faraday in England.'
The dimension of inductance is given by:
According to the NCERT text, 'Inductance... has the dimensions of [M L$^2$ T$^{-2}$ A$^{-2}$] given by the dimensions of flux divided by the dimensions of current.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.