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2nd Year

This document is a physics examination paper for 2nd Year students at PACE Academy, Rahim Yar Khan Campus, covering topics related to electromagnetism. It consists of multiple-choice questions, short answer questions, and long questions, focusing on concepts such as induced emf, Lenz's law, and mutual induction. The total marks for the paper are 35, with a time limit of 50 minutes.

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zohaib mazhar
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22 views1 page

2nd Year

This document is a physics examination paper for 2nd Year students at PACE Academy, Rahim Yar Khan Campus, covering topics related to electromagnetism. It consists of multiple-choice questions, short answer questions, and long questions, focusing on concepts such as induced emf, Lenz's law, and mutual induction. The total marks for the paper are 35, with a time limit of 50 minutes.

Uploaded by

zohaib mazhar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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The PACE ACADEMY

Rahim Yar Khan Campus


Name: _________________________ Class: 2nd Year Section: _________
Paper: Physics (T-4) Total Marks: 35 Total Time: 50 min.

Q.No.1. Circle the Correct Option. (1 x 10 = 10)


1) The magnitude of current induced in a conductor depends upon
a) Number of turns b) Speed of conductor c) Strength of magnetic field d) All of these
2) The motional emf is given by
a) qvB b) IBL c) eBL d) vBL
3) The motional emf in a conductor depends upon the
a) Length b) Orientation c) Magnetic field d) All of the above
4) The negative sign with induced emf in Faraday's law is in accordance with
a) Lenz's law b) Ampere's law c) Gauss's law d) Induced emf
5) If we make magnetic field stronger the value of induced current.
a) Decrease b) Increase c) Vanishes d) Remains constant
6) Lenz's law deals with
a) Magnitude of emf b) Direction of emf
c) Direction of induced current d) Magnitude of induced current
7) Self - induced emf is sometimes called as
a) Motional emf b) Constant emf c) Back emf d) Variable emf
8) An inductor may store energy in
a) Its magnetic field b) Its electric field c) Its coil d) A neighboring circuit
9) Which one is not present in A.C generator?
a) Armature b) Magnet c) Slip rings d) Commutator
10) Energy stored per unit volume inside a solenoid is called
a) Electric flux b) Energy density c) Work d) Power

Q.No.2. Give the Short Answers. (2 x 5 = 10)


1. Does the induced emf always act to decrease the flux through a circuit?
2. Does the induced emf in a circuit depend on the resistance of the circuit? Does the induce current depend on
the resistance of the circuit?
3. Four unmarked wires emerge from a transformer what steps would you take to determine the turn’s ratio?
4. What is self-inductance? And writes its formula.
5. What is back motor effect in generators?
Q.No.3. Long Question. (5+5+5 = 15)
a) Explain the phenomenon mutual Induction.
b) Drive an expression for energy stored in an inductor.
c) Explain the phenomena of self-induction. Define self-inductance, also write its units.

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