Current Electricity

Question 1

Slope of V-I graph gives

Answer 1

Resistance

Question 2

Slope of I-V graph gives

Answer 2

Conductance

Question 3

With increase in temperature…
collision, relaxation time, resistivity, resistance…

Answer 3

Collision: increases
Relaxation time: decreases
Resistivity: increases
Resistance: increases

Question 4

Emf of a cell depends on what?

Answer 4

1) nature of electrolyte
2) metal of electrodes

Question 5

Internal resistance depends on?

Answer 5

Distance between the electrodes, area dipped in electrolyte, concentration of electrolyte and temperature.

Question 6

Equivalent resistance between the adjacent corners of a regular n-side polygon of uniform wire of resistance R would be

Answer 6

(n-1) R/n^2

Question 7

In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor…

Answer 7

moves in a curved path from lower to higher potential

Question 8

Why alloys such as constantan and manganin are used in making standard resistance coils?

Answer 8

Because of their small value of temperature coefficient of resistance.

Question 9

Factors affecting the sensitivity of a galvanometer are…

Answer 9

a) Number of turns in the coil

b) Area of the coil

c) Magnetic field strength B

d) The magnitude of a couple per unit twist k/nAB