A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will:

 1 increase 2 decrease 3 remain constant 4 become zero
Subtopic:  Derivation of Ohm's Law |
59%
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Two resistors A and B have resistances RA and RB respectively with RA < RB . The resistivities of their materials are ρA and ρB

1.   ρA > ρ

2.   ρA = ρB

3.   ρA < ρ

4.   The information is not sufficient to find the relation between ρA and ρB

Subtopic:  Derivation of Ohm's Law |
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The product of resistivity and conductivity of a cylindrical conductor depends on

1.   temperature

2.   material

3.   area of cross-section

4.   none of these.

Subtopic:  Derivation of Ohm's Law |
56%
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

 1 increases 2 decreases 3 remains constant 4 may increase or decrease
Subtopic:  Derivation of Ohm's Law |
76%
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A uniform wire of resistance $$50~\Omega$$  is cut into $$5$$ equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is:

 1 $$2~\Omega$$  2 $$10~\Omega$$  3 $$250~\Omega$$  4 $$6250~\Omega$$
Subtopic:  Derivation of Ohm's Law |
75%
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Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

 (a) drift speed (b) resistivity (c) resistance (d) the number of free electrons

Choose the correct option:

 1 (d) only 2 (b), (c) 3 (c), (d) 4 (a), (d)
Subtopic:  Derivation of Ohm's Law |
52%
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