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JEE Advanced Moving Charges and Magnetism — practice questions — page 2

Explore 62 free Moving Charges and Magnetism questions in JEE Advanced 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 31–60 of 62.

Moving charges, mixed checkRead the answer and worked solution →What the cyclotron frequency ignoresRead the answer and worked solution →A long straight wire carries $5$ A. The magnetic field $0.10$ m away from the wire is:Read the answer and worked solution →Depends on speed or notRead the answer and worked solution →Symbol to quantityRead the answer and worked solution →Currents make fieldsRead the answer and worked solution →Reading the Lorentz forceRead the answer and worked solution →Force on a current wireRead the answer and worked solution →The current carrying conductorRead the answer and worked solution →The cyclotron machineRead the answer and worked solution →Formula to what it describesRead the answer and worked solution →Using Biot-SavartRead the answer and worked solution →Odd one out: magnetismRead the answer and worked solution →Which is largerRead the answer and worked solution →Odd one out: what a current doesRead the answer and worked solution →Zero work, changing directionRead the answer and worked solution →Moving charges, mixed checkRead the answer and worked solution →The Lorentz forceRead the answer and worked solution →Charge in a uniform fieldRead the answer and worked solution →Count and computeRead the answer and worked solution →Field of a circular coilRead the answer and worked solution →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 →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 →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 →The Biot-Savart lawRead the answer and worked solution →True of the magnetic forceRead the answer and worked solution →The SI unit Henry (H) is equivalent to:Read the answer and worked solution →Field and force directionsRead the answer and worked solution →

Worked practice questions

Moving charges, mixed check

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Questions
  1. Statement is true
    Yes
    Statement
    The Lorentz force is F = q(v cross B + E).
  2. Statement is true
    No
    Statement
    Cyclotron frequency depends on the orbit radius.
  3. Statement is true
    Yes
    Statement
    Biot-Savart needs integration for a full conductor.
  4. Statement is true
    Yes
    Statement
    The force on a current wire is I l cross B.
Instructions
Tap True or False for each statement.
_Source: syllabus Physics Part 1, Ch 4 'Moving Charges and Magnetism' (leph104)_

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What the cyclotron frequency ignores

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Questions
  1. Statement is true
    Yes
    Statement
    The cyclotron frequency is independent of the particle's speed.
  2. Statement is true
    Yes
    Statement
    It is independent of the orbit radius.
  3. Statement is true
    Yes
    Statement
    It depends on the charge and the field.
  4. Statement is true
    No
    Statement
    A faster particle always has a higher cyclotron frequency.
Instructions
Tap True or False for each statement.
_Source: syllabus Physics Part 1, Ch 4 'Moving Charges and Magnetism' (leph104)_

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A long straight wire carries $5$ A. The magnetic field $0.10$ m away from the wire is:

  1. $1.0\times 10^{-5}$ T, by $B = \mu_0 I/(2\pi r)$
  2. $5\times 10^{-7}$ T, ignoring the $2\pi$ factor here
  3. $1.0$ T, ignoring all scaling on the formula
  4. Zero, since the wire is straight, not coiled
Show answer and solution

Correct answer: A. $1.0\times 10^{-5}$ T, by $B = \mu_0 I/(2\pi r)$

$B = 4\pi\times 10^{-7}\cdot 5/(2\pi\cdot 0.1) = 1.0\times 10^{-5}$ T.

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