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In the given figure, the Earth's magnetism is imagined to be due to a magnet placed at a small angle to its axis of rotation, with the South pole in the northern hemisphere. A dip-needle will then be set horizontally

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Important Questions on Magnetic Effects of Electric Current and Magnetism

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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 18
Frequency of the AC main in India is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 19
The output of a dynamo using a split ring commutator is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 20
A choke coil
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 21

Two electric bulbs, each designed to operate with a power of 500 W in 220 V lines are put in series in a 110 V. What will be the power generated by each bulb?

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 22
An L-C circuit has frequency f now if a resistance R<2LC introduced in the circuit, then the frequency will become/remain
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 23
When power is drawn from the secondary circuit of a transformer, then the dynamic resistance
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 24
The core used in transformers and other electromagnetic device is laminated to
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 12 - Magnetic Effects of Electric Current and Magnetism>Practice Exercise>Q 25
In a step-down transformer, the input voltage is 22 kV and the output voltage is 550 V. The ratio of number of turns in the secondary to primary is