MCQ
If the thermionic current density is J and emitter temperature is T then the curve between $\frac{J}{T_2}$ and $\frac{1}{T}$ will be
- A
- B
- ✓
- D
✓
Answer
Correct option: C.
(c) 
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is
A circular coil and a bar magnet placed near by are made to move in the same direction. The coil covers a distance of $1\, m$ in $0.5\, sec$ and the magnet a distance of $2\, m$ in $1\, sec$. The induced emf produced in the coil.....$V$
→In conductor when electrons move between two collisions, their paths are $... A...$ when external fields are absent and $... B...$ when external filed is present. Here, $A$ and $B$ refer to:
→The electric potential in volts due to an electric dipole of dipole moment $2 \times 10^{-8}$ coulomb-metre at a distance of $3 \,m$ on a line making an angle of $60^{\circ}$ with the axis of the dipole is ..........
→A dry cell has an e.m.f. of 1.5 V and an internal resistance of 0.05Ω. The maximum current obtainable from this cell for a very short time interval is
The resistance of a wire is $R$. It is bent at the middle by $180^o$ and both the ends are twisted together to make a shorter wire. The resistance of the new wire is
→A current of $0.1 \,A$ flows through a $25 \,\Omega$ resistor represented by the circuit diagram. The current in $80 \,\Omega$ resistor is ........... $A$
→A point charge $q$ is held at the centre of a circle of radius $r . B, C$ are two points on the circumference of the circle and $A$ is a point outside the circle. If $W_{A B}$ represents work done by electric field in taking a charge $q_0$ from $A$ to $B$ and $W_{A C}$ represents the workdone from $A$ to $C$, then
→Mark out the correct options.
Which of the following pn junction is not used in reverse bias?