Physics · JEE

Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel Mock Test for JEE

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Syllabus context

Part of Current Electricity in JEE Main Physics.

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Q1PhysicsUnit 12: Current Electricity

Fuse wire should be placed in the path of wire

Q2PhysicsUnit 12: Current Electricity

There are a large number of cells available, each marked

(6 V, 0.5 \Omega)

to be used to supply current to a device of resistance

0.75 \Omega,

requiring

24 A

current. How should the cells be arranged, so that power is transmitted to the load using minimum number of cells?

Q3PhysicsUnit 12: Current Electricity

A current of

I

ampere flows through a resistance

R

when connected across a cell of emf

E

and internal resistance

1 \Omega

When

R

is increased by

50 \%

, the current through the circuit is

0.8 A .

The value of

\boldsymbol{R}

is :

Q4PhysicsUnit 12: Current Electricity

In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire

x

cm long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)

Q5PhysicsUnit 12: Current Electricity

If the switch at point

P

is opened (shown in the figure) choose the correct option

Q6PhysicsUnit 12: Current Electricity

A battery of emf

10 \mathrm{v}

and internal resistance of 0.5 ohms is connected across

A

variable resistance R.The maximum value of

\mathrm{R}

is given by:

Q7PhysicsUnit 12: Current Electricity

A galvanometer in a circuit:

Q8PhysicsUnit 12: Current Electricity

A battery has six cells in series and each cell has an electromagnetic force

1.5 V

and internal resistance

1 \Omega .

If an external load of resistance

24 \Omega

is connected to it. The potential drop across the load is

Q9PhysicsUnit 12: Current Electricity

Two batteries, one of emf 18 volts and internal resistance

2 \Omega

and the other of emf 12 volt and internal resistance 1\Omega, are connected as shown.The voltmeter will record a reading of:

Q10PhysicsUnit 12: Current Electricity

In a battery five dry cells each of 1.5 volt have internal resistance of 0.2,0.3,0.4,0.5 and

0.6 \Omega

are present in series. The battery is connected to a

1 \Omega

resistance. Identify the correct statement

(s)

Q11PhysicsUnit 12: Current Electricity

The unit of e.m.f. of a cell is:

Q12PhysicsUnit 12: Current Electricity

The wire having a green plastic covering is a

Q13PhysicsUnit 12: Current Electricity

A cell sends a current through a resistance

R

for time

t ;

next the same cell sends current through another resistance

r

for the heat is developed in both the resistance, then the internal resistance of the cell is:

Q14PhysicsUnit 12: Current Electricity

Two cells of unequal emfs,

\boldsymbol{E}_{1}

and

\boldsymbol{E}_{2}

the internal resistance

r_{1}

and

r_{2}

are joined as shown.

V_{A}

and

V_{B}

are the potentials at

A

and

B

respectively This question has multiple correct options

Q15PhysicsUnit 12: Current Electricity

Assertion Electromotive force is a force which help the electrons to flow and produce current. Reason Electromotive force is independent of the voltage across the cell

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