Resistance of tungsten wire at 150°C is 133 Ω. Its resistance temperature coefficient is 0.0045/°C. The resistance of this wire at 500°C will be 

Which of the following has a negative temperature coefficient of resistance?

The reciprocal of resistance is :

A solenoid is at the potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be :

All of the following statements are true except 

The resistance of a discharge tube is :

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are :

σ₁ and σ₂ are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

A copper wire has a square cross-section, 2.0 mm on a side. It carries a current of 8 A and the density of free electrons is 8 × 10²⁸ m^–3. The drift speed of electrons is equal to 

What length of the wire of specific resistance $48\times {10}^{-8}\Omega m$is needed to make the resistance of 4.2 Ω (diameter of wire = 0.4 mm) 

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of 

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be :

Express which of the following setups can be used to verify Ohm’s law 

(1)
(2)
(3)
(4)

In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 × 10¹⁵ electrons are moving from right to left and 3.12 × 10¹⁵ protons are moving from left to right per sec. What is the electric current in the discharge tube and what is its direction :

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then :

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance :

The potential difference between points A and B of the adjoining figure is

Two resistors of resistance R₁ and R₂ having R₁ > R₂ are connected in parallel. For equivalent resistance R, the correct statement is :

A wire of resistance R is divided into 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:

Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be 

There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be :

Equivalent resistance between A and B will be 

Referring to the figure below, the effective resistance of the network is 

Two resistances are joined in parallel whose resultant is $\frac{6}{8}$ ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was 

The equivalent resistance of resistors connected in series is always :

A cell of negligible resistance and e.m.f. 2 volts is connected to a series combination of 2, 3, and 5 $\Omega$. The potential difference in volts between the terminals of 3 $\Omega$ resistance will be :

Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is :

Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases is 9 ohm and 2 ohms respectively. Then the resistances of the component resistors are :

Resistors of 1, 2, 3 ohm are connected in the form of a triangle. If a 1.5-volt cell of negligible internal resistance is connected across a 3-ohm resistor, the current flowing through this resistance will be :

Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current 0.5 ampere as shown in figure, the potential difference $V_P-V_Q$ is