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Karnataka PUC II Moving Charges and Magnetism — practice questions — page 6

Explore 193 free Moving Charges and Magnetism questions in Karnataka PUC II Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Moving Charges and Magnetism questions and exercises with answers

Showing questions 151–180 of 193.

The self-inductance of a long air-cored solenoid of length $\ell$, cross-sectional area $A$ and total number of turns $N$ is:Read the answer and worked solution →Complete the magnet ruleRead the answer and worked solution →Sort the magnetic materialsRead the answer and worked solution →Order what happens to domainsRead the answer and worked solution →Substances that are weakly magnetised in a field are:Read the answer and worked solution →A ferromagnet is divided internally into regions called:Read the answer and worked solution →In an unmagnetised ferromagnet, the domains are:Read the answer and worked solution →Above a certain temperature, a ferromagnet becomes a:Read the answer and worked solution →The Earth's magnetic field runs approximately from geographic:Read the answer and worked solution →Inside a diamagnetic material, the field is:Read the answer and worked solution →Diamagnetism arises in atoms whose electrons have no net:Read the answer and worked solution →The magnetic moment of a bar magnet equals that of an equivalent:Read the answer and worked solution →A bar magnet behaves like a magnetic:Read the answer and worked solution →Inside a long solenoid carrying current $I$ with $n$ turns per unit length, the magnetic field isRead the answer and worked solution →A $50$-turn coil has a magnetic flux changing through it at a uniform rate of $4 \times 10^{-3}\,\text{Wb/s}$. The induced EMF in the coil is:Read the answer and worked solution →Field lines of a bar magnet differ from an electric dipole's because they:Read the answer and worked solution →Substances that are strongly magnetised in a field are:Read the answer and worked solution →Cutting a bar magnet in half gives:Read the answer and worked solution →A bar magnet can be modelled as a large number of:Read the answer and worked solution →Spot the odd one outRead the answer and worked solution →Name the magnetic classRead the answer and worked solution →Lenz's law is a direct consequence of:Read the answer and worked solution →The energy stored in an inductor of inductance $L$ carrying a steady current $I$ is:Read the answer and worked solution →An ideal LC circuit oscillates freely. If $L = 4\,\text{mH}$ and $C = 25\,\mu\text{F}$, the angular frequency of oscillation is:Read the answer and worked solution →True or false about magnetsRead the answer and worked solution →Magnetism and matter bingoRead the answer and worked solution →A bar magnet with N pole pointing right is placed near a circular current loop whose magnetic moment also points right. The interaction isRead the answer and worked solution →The Biot-Savart lawRead the answer and worked solution →The magnitude of the magnetic field at perpendicular distance r from an infinite straight wire carrying current I isRead the answer and worked solution →True of the magnetic forceRead the answer and worked solution →

Worked practice questions

The self-inductance of a long air-cored solenoid of length $\ell$, cross-sectional area $A$ and total number of turns $N$ is:

  1. $\mu_0 N A \ell$
  2. $\mu_0 N^2 A \ell$
  3. $\mu_0 N^2 A / \ell$
  4. $\mu_0 N A / \ell$
Show answer and solution

Correct answer: C. $\mu_0 N^2 A / \ell$

For a long solenoid the field inside is $B = \mu_0 n I = \mu_0 (N/\ell) I$. Flux through each turn is $BA$ and total linkage is $N(BA)$, giving $L = N\Phi/I = \mu_0 N^2 A / \ell$. Equivalently $L = \mu_0 n^2 A \ell$ if $n = N/\ell$.

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Complete the magnet rule

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Missing parts
  1. Answer
    closed
    Choices
    1. closed
    2. open
    3. broken
  2. Answer
    monopoles
    Choices
    1. monopoles
    2. dipoles
    3. domains
Complete the statement
Magnetic field lines form {0} loops, because magnetic {1} do not exist.
Instructions
Drag a word into each gap to finish the sentence.
_Source: syllabus Physics, Ch 5 'Magnetism and Matter'_

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Sort the magnetic materials

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Items
  1. Item
    Repelled by field
    Category
    Diamagnetic
  2. Item
    Field pushed out
    Category
    Diamagnetic
  3. Item
    Weakly magnetised
    Category
    Paramagnetic
  4. Item
    Follows field
    Category
    Paramagnetic
  5. Item
    Strong response
    Category
    Ferromagnetic
  6. Item
    Has domains
    Category
    Ferromagnetic
Categories
  1. Item
    Diamagnetic
  2. Item
    Paramagnetic
  3. Item
    Ferromagnetic
Instructions
Tap an item, then tap the box it belongs in.
_Source: syllabus Physics, Ch 5 'Magnetism and Matter'_

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