Statement I The temperature coefficient of resistance for most of metals in pure form is positive.
Statement II A metal wire 2 mm in diameter carries a charge of $360 \pi \mathrm{C}$ in two hours. If the metal contains $5 \times 10^{22}$ free electrons $/ \mathrm{cm}^3$, then drift velocity of the electrons in the wire is $6.25 \times 10^{10} \mathrm{~m} / \mathrm{s}$.
Statement III Semiconductors like pure germanium does not obey Ohm's law for all range of electric field values.
Which of the following is correct?
A cylindrical resistor of radius 7.0 mm and length 4.0 cm is made of material that has a resistivity of $10^{-6} \Omega-\mathrm{m}$. If the energy is dissipated at rate 1.54 W in the resistor, then the current density is
Statement I A uniform electric field and a uniform magnetic field are pointed in the same direction. If an electron is projected in the same direction, the electron velocity will decrease in magnitude.
Statement II Two infinite long parallel wires are carrying current in the same direction. The magnetic field at a point mid-way between the wires is zero.
Statement III No net force acts on a rectangular coil carrying a steady current, when suspended in a uniform magnetic field.
Which of the following is correct?
Two parallel conductor each 50 m long, separated by 0.2 m experience a force of 1 N . If the current in first conductor is twice that of the second conductor, then what is the current in the second conductor?
$$ \left(\mu=4 \pi \times 10^{-7}\right) $$
TS EAMCET Papers
All year-wise previous year question papers