Four wires meet at a junction. The first carries 4A in to the junction, the second carries 5A out of the junction, and third carries 2A out of the junction. The fourth carries:
Correct answer: D. 3A in to the junction
- A. 7A out of the junction
- B. 7A into the junction
- C. 3A out of the junction
- D. 3A in to the junction
Explanation
D. Kirchoff's Junction rule states that the total current into a junction is equal to that out of the junction hence 3+4in = 5+2out
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Steady Current
Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Steady Current questions
The sum of the e.m.f and potential differences around a closed circuit is zero is a consequence of:
For ohmic substance, the electron drift velocity is proportional to:
Kirchoff's fist law (KCL) is based upon the law of conservation of:
A 0.01A moving coil Galvanometer of 5 Ω resistance can be converted into a 0.2A ammeter by a resistance R with the Galvanometer when r is:
A total charge of 100C flows through a 12W bulb in a time of 50 second. What is the potential difference across the bulb during this time?
Kirchofrs current law (KM.) Is based upon law Of conservation of: