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Two equal resistors R are connected in parallel, and a battery of 12 V is connected across this combination. A dc current of 100 mA flows through the circuit as shown below:

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The value of R is

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Important Questions on Current Electricity

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NDA & NA EE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2020 General Ability Test>Q 4
A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to
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IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2020 General Ability Test>Q 5
When the short circuit condition occurs, the current in the circuit
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NDA & NA EE
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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 2 General Ability Test>Q 6
Which one of the following statements regarding Ohm's law is not correct?
EASY
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IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 2 General Ability Test>Q 7
"The sum of emf's and potential differences around a closed loop equals zero" is a consequence of
EASY
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IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 2 General Ability Test>Q 8
Consider the following part of an electric circuit.

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The total electrical resistance in the given part of the electric circuit is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 2 General Ability Test>Q 9
Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on

1. supply voltage

2. current passing through the coil

3. time for which voltage is supplied Select the correct answer using the codes given below.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 1 General Ability Test>Q 10
Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r and the length is l/2, then the resistance of this wire will be
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IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Current Electricity>NDA & NA EE 2019 Paper 1 General Ability Test>Q 11
Two metallic wires A and B are made using copper. The radius of wire A is r while its length is l. A DC voltage V is applied across the wire A, causing power dissipation P. The radius of wire B is 2r and its length is 2l and the same DC voltage V is applied across it causing power dissipation P1. Which one of the following is the correct relationship between P and P1?