Question
A heating element using nichrome connected to a 230 V supply draws an initial current of 4.6 A which settles after a few seconds to a steady value of 2.3 A . What is the steady temperature of the heating element if the room temperature is $27^{\circ} C$. [ $\left.\alpha=1.7 \times 10^{-4}{ }^{\circ} C ^{-1}\right]$

Answer

Self

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A simple pendulum of length (l) is pulled aside to make an angle $\theta$ with the vertical. Find the magnitude of the torque of the weight (w) of the bob about the point of suspension. When is the torque zero?
Why is the mass of a nucleus always less than the sum of the masses of its constituents, neutrons and protons?

If the total number of neutrons and protons in a nuclear reaction is conserved, how then is the energy absorbed or evolved in the reaction? Explain.

Find the ratio of the linear momenta of two particles of masses 1.0kg and 4.0kg if their kinetic energies are equal.
Characteristic X-rays may be used to identify the element from which they are being emitted. Can continuous X-rays be used for this purpose?
Calculate the distance of closest approach of $\alpha$-particle which has kinetic energy 4.5 MeV , collides with the nucleus of $Z=80$ and reversed in its direction after rest.
Can we perform Young's double slit experiment with sound waves? To get a reasonable "fringe pattern", what should be the order of separation between the slits? How can the bright fringes and the dark fringes be detected in this case?
A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the
  1. Total torque on the coil,
  2. Total force on the coil,
  3. Average force on each electron in the coil due to the magnetic field.
(The coil is made of copper wire of cross-sectional area 10–5 m2 , and the free electron density in copper is given to be about 1029 m–3).
Consider a non-conducting ring of radius r and mass m that has a total charge q distributed uniformly on it. The ring is rotated about its axis with an angular speed $\omega.$
  1. Find the equivalent electric current in the ring.
  2. Find the magnetic moment $\mu$ of the ring.
  3. Show that $\mu=\frac{\text{q}}{2\text{m}}\text{l}$ where l is the angular momentum of the ring about its axis of rotation.
Draw a plot showing the variation of photoelectric current with collector plate potential for two different frequencies, ν1 > ν2, of incident radiation having the same intensity. In which case will the stopping potential be higher? Justify your answer.
An electron microscope uses electrons accelerated by a voltage of 50 kV. Determine the de Broglie wavelength associated with the electrons. If other factors (such as numerical aperture, etc.) are taken to be roughly the same, how does the resolving power of an electron microscope compare with that of an optical microscope which uses yellow light?