Physics Ncert Solutions Class 12th

A galvanometer coil has 500 turns and each turn has an average are of $3*{10}^{-4}{\mathrm{m}}^2$ . If a torque of  $1.5\mathrm{N}\mathrm{m}$ is required to keep this coil parallel to a magnetic field when a current of $0.5\mathrm{A}$  is flowing through it, the strength of the field (in $\mathrm{T}$  ) is

A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil?

Three positions shown describe:

(a) the magnet's entry

(b) magnet is completely inside and

(c) magnet's exit

Take the breakdown voltage of the zener diode used in the given circuit as $6\mathrm{V}$ $$ . For the input voltage shown in figure below, the time variation of the output voltage is: (Graphs drawn are schematic and not to scale)

If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 $\mathrm{n}\mathrm{m}$   , then its band gap energy is:

Planck's constant $h=6.63*{10}^{-34}$ J.s.

Speed of light $\mathrm{}\mathrm{c}=3*{10}^8\mathrm{m}/\mathrm{s}$  

Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?

On the $$ $x$ -axis and at a distance $x$ $$ from the origin, the gravitational field due to a mass distribution is given by $\frac{Ax}{{\left(x^2+a^2\right)}^{3/2}}$ $\frac{}{{\left({}^{}{}^{}\right)}^{}}$ in the $x$ $$ -direction. The magnitude of gravitational potential on the $x$ $$ -axis at a distance $x$ $$ , taking its value to be zero at infinity is:

The Boolean expression Y = A'BC + AC can be realised with which of the following gate configurations.
A. One 3-input AND gate, 3 NOT gates and one 2-input OR gate, One 2 -input AND gate,
B. One 3-input AND gate, 1 NOT gate, One 2-input NOR gate and one 2-input OR gate
C. 3-input OR gate, 3 NOT gates and one 2-input AND gate
Choose the correct answer from the options given below