current electricity class12

Authored by Indu Wadhwa

Physics

12th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

SI unit of current

$Cs^{-1}$

$C^{-1}S$

$CS$

$C^2S^{-1}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Relation between electric current and mobility I=

$enA\mu_eE$

$\mu E$

$neAV_d$

$V_d\mu$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

SI UNIT OF MOBILITY

$m^2V^{-1}S^{-1}$

ohm

$\Omega m$

$m^2V^2S^{-1}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

IN JUNCTION RULE,SUM OF CURRENTS AT ANY JUNCTION IS

ZERO

V/R

NONE

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Vector form of OHMS LAW

V = IR

$j^{\rightarrow}=\sigma E^{\rightarrow}$

G=1/R

NONE

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 Ω, what is the maximum currentthat can be drawn from the battery?

20 A

30A

10A

100A

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistanceof 2.7 Ω at 100 °C. Determine the temperature coefficient ofresistivity of silver.

$0.00394\degree C^{-1}$

$0.000394\degree C^{-1}$

$1.00394\degree C^{-1}$

$0.00994\degree C^{-1}$

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?

$12.25V$

$0.25V$

$2.25V$

10.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

$\frac{R_1}{R_2}=\frac{R_3}{R_4}$ IS THE CONDITION OF BALANCED

POTENTIOMETER

WHEATSTONE BRIDGE

OHMS LAW

KIRCHOFFS RULE

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current electricity class12

SI unit of current

Relation between electric current and mobility I=

SI UNIT OF MOBILITY

IN JUNCTION RULE,SUM OF CURRENTS AT ANY JUNCTION IS

Vector form of OHMS LAW

The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 Ω, what is the maximum currentthat can be drawn from the battery?

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistanceof 2.7 Ω at 100 °C. Determine the temperature coefficient ofresistivity of silver.

In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?

Six lead-acid type of secondary cells each of emf 2.0 V and internalresistance 0.015 Ω are joined in series to provide a supply to aresistance of 8.5 Ω. What are the current drawn from the supply

R1R2=R3R4\frac{R_1}{R_2}=\frac{R_3}{R_4}R2​R1​​=R4​R3​​ IS THE CONDITION OF BALANCED

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$\frac{R_1}{R_2}=\frac{R_3}{R_4}$ IS THE CONDITION OF BALANCED