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NEET UG Moving Charges and Magnetism — practice questions

Explore 180 free Moving Charges and Magnetism questions in NEET UG 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 1–30 of 180.

A bismuth bar near a strong magnet on the lab table is:Read 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 →The magnetic force on a charge $q$ moving with velocity $\vec{v}$ in a magnetic field $\vec{B}$ isRead the answer and worked solution →A positive charge moves with velocity $\vec{v}$ PARALLEL to a uniform magnetic field $\vec{B}$. The magnetic force on it isRead the answer and worked solution →The magnetic field at the CENTRE of a circular current loop of radius $R$ carrying current $I$ isRead 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 current loop of area $A$ carrying current $I$ has a MAGNETIC MOMENT of magnitudeRead the answer and worked solution →The magnetic field at a distance $r$ from a LONG STRAIGHT wire carrying current $I$ isRead the answer and worked solution →NEET · Physics · Magnetic Formula ↔ QuantityRead the answer and worked solution →NEET · Physics · Right-Hand RulesRead the answer and worked solution →The Lorentz forceRead the answer and worked solution →Work done by a magnetic forceRead 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 →Charge in a uniform fieldRead the answer and worked solution →What the cyclotron frequency ignoresRead the answer and worked solution →The cyclotron machineRead the answer and worked solution →Formula to what it describesRead the answer and worked solution →The Biot-Savart lawRead the answer and worked solution →Using Biot-SavartRead the answer and worked solution →Field of a circular coilRead the answer and worked solution →Odd one out: magnetismRead the answer and worked solution →Depends on speed or notRead the answer and worked solution →True of the magnetic forceRead the answer and worked solution →Symbol to quantityRead the answer and worked solution →Which is largerRead the answer and worked solution →Field and force directionsRead the answer and worked solution →Currents make fieldsRead the answer and worked solution →Count and computeRead the answer and worked solution →

Worked practice questions

A bismuth bar near a strong magnet on the lab table is:

  1. Weakly repelled, since bismuth is a diamagnetic substance
  2. Strongly attracted, similar to iron on the bench
  3. Unaffected entirely, since bismuth has no magnetic response
  4. Weakly attracted, since all metals respond to a magnet
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Correct answer: A. Weakly repelled, since bismuth is a diamagnetic substance

Bismuth is diamagnetic, hence weakly repelled.

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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
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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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The magnetic force on a charge $q$ moving with velocity $\vec{v}$ in a magnetic field $\vec{B}$ is

  1. $q\vec{v} + \vec{B}$
  2. $q\vec{v}\cdot\vec{B}$
  3. $q\vec{v}\times\vec{B}$
  4. $\vec{v}/(qB)$
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Correct answer: C. $q\vec{v}\times\vec{B}$

1. Your syllabus: the Lorentz magnetic force is $\vec{F} = q\vec{v}\times\vec{B}$. 2. The cross product means $\vec{F}$ is perpendicular to BOTH $\vec{v}$ and $\vec{B}$. 3. Magnitude: $F = q v B \sin\theta$, where $\theta$ is the angle between $\vec{v}$ and $\vec{B}$. 4. Direction: by the right-hand rule (point fingers along $\vec{v}$, curl toward $\vec{B}$, thumb gives $\vec{F}$ direction for positive $q$; reverse for negative $q$). 5. Option A has wrong dimensions (mixing $qv$ and $\vec{B}$). Option B is the dot product (a scalar, not a force vector). Option D is gibberish dimensionally. _Source: syllabus Physics Part 1, Ch 4, §4.2 (Magnetic Force, Eq. 4.4), p. 2–3._

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