Magnetic Effect of Current
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Questions and Answers

What is the direction of the magnetic force experienced by each element of the loop?

  • At an angle of 45° to the plane of the loop
  • In the direction of the current
  • Perpendicular to the plane of the loop (correct)
  • Parallel to the plane of the loop

What happens to the spring when current starts flowing through it?

  • It expands
  • It remains unchanged
  • It contracts (correct)
  • It breaks

What is the condition for the strings to become tensionless?

  • The magnetic force is zero
  • The weight of the conductor is equal to the magnetic force (correct)
  • The weight of the conductor is less than the magnetic force
  • The weight of the conductor is greater than the magnetic force

What is the direction of the magnetic field in Fig. 21.44?

<p>Perpendicular to the plane of the loop (A)</p> Signup and view all the answers

What is the relation between the momentum of a charged particle and its kinetic energy, after accelerating through a potential difference V?

<p>p = 2sqrt(mK) (C)</p> Signup and view all the answers

What happens to the loop when current flows through it?

<p>It stretches and opens into a circular loop (B)</p> Signup and view all the answers

What is the direction of the magnetic force on a charged particle, when it moves at an angle to the magnetic field?

<p>Perpendicular to the velocity and magnetic field (C)</p> Signup and view all the answers

What is the time period of a charged particle moving in a circular path, under the influence of a magnetic field?

<p>T = 2Ï€m/qB (B)</p> Signup and view all the answers

What is the net force on a charged particle, moving in a region with both electric and magnetic fields?

<p>F = qE + q(v × B) (D)</p> Signup and view all the answers

What is the path of a charged particle, when it moves in a region with a parallel electric and magnetic field?

<p>Straight-line path (A)</p> Signup and view all the answers

What is the equation for the kinetic energy of a charged particle, after accelerating through a potential difference V?

<p>K = 2mqV (A)</p> Signup and view all the answers

What is the principle behind the 'velocity-selector'?

<p>Hall Effect (D)</p> Signup and view all the answers

What is the maximum energy gained by a charged particle in a magnetic field?

<p>q^2 B^2 / 2m (C)</p> Signup and view all the answers

What is the phenomenon of producing a transverse emf in a current-carrying conductor on applying a magnetic field perpendicular to the direction of the current?

<p>Hall Effect (D)</p> Signup and view all the answers

What is the direction of the electric field in a conductor with electrons as current carriers?

<p>Opposite to the direction of the flow of current (C)</p> Signup and view all the answers

What is the direction of the magnetic field in which a current-carrying coil experiences no torque?

<p>Perpendicular to the plane of the coil (C)</p> Signup and view all the answers

What is the equation for the torque experienced by a rectangular current-carrying coil placed in a uniform magnetic field?

<p>$\tau = B\times I\times A\times sin(\theta)$ (D)</p> Signup and view all the answers

What is the direction of the force experienced by a current-carrying conducting rod sliding on inclined rails?

<p>Down the plane and opposite to the direction of the magnetic field (C)</p> Signup and view all the answers

What is the condition for a rectangular current-carrying coil to experience a maximum torque in a uniform magnetic field?

<p>The plane of the coil is perpendicular to the direction of the magnetic field (A)</p> Signup and view all the answers

What is the orientation of the electric and magnetic fields in a 'velocity-selector'?

<p>The electric and magnetic fields are perpendicular to each other. (B)</p> Signup and view all the answers

What is the direction of the magnetic force experienced by a charged particle moving in a region with both electric and magnetic fields?

<p>It is perpendicular to both the electric and magnetic fields. (A)</p> Signup and view all the answers

What is the principle behind the Hall effect?

<p>The production of an electric field perpendicular to the direction of the current and the magnetic field. (D)</p> Signup and view all the answers

What is the effect of a magnetic field on a charged particle moving in a circular path?

<p>It changes the direction of the velocity of the charged particle. (D)</p> Signup and view all the answers

What is the necessary condition for a conductor to suspend freely in air?

<p>The tension in the strings must be zero. (A)</p> Signup and view all the answers

What is the direction of the magnetic moment of a current carrying circular coil?

<p>Perpendicular to the plane of the coil (C)</p> Signup and view all the answers

What is the maximum value of torque experienced by a current carrying coil in a magnetic field?

<p>2MB (D)</p> Signup and view all the answers

What is the effect of increasing the number of turns in a coil on the magnetic field at its center?

<p>The magnetic field increases by a factor of n^2 (B)</p> Signup and view all the answers

What is the purpose of the soft-iron core in a moving coil galvanometer?

<p>To make the magnetic field radial (A)</p> Signup and view all the answers

What is the potential energy of a current carrying coil in a magnetic field?

<p>-MB cosθ (D)</p> Signup and view all the answers

What is the condition for a coil to experience maximum torque in a magnetic field?

<p>θ = 90° (D)</p> Signup and view all the answers

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