Magnetic Effect of Current

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?

Perpendicular to the plane of the loop (A) 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 = 2sqrt(mK) (C) Signup and view all the answers

What happens to the loop when current flows through it?

It stretches and opens into a circular loop (B) 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?

Perpendicular to the velocity and magnetic field (C) 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?

T = 2πm/qB (B) 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?

F = qE + q(v × B) (D) 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?

Straight-line path (A) 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?

K = 2mqV (A) Signup and view all the answers

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

Hall Effect (D) Signup and view all the answers

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

q^2 B^2 / 2m (C) 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?

Hall Effect (D) Signup and view all the answers

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

Opposite to the direction of the flow of current (C) Signup and view all the answers

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

Perpendicular to the plane of the coil (C) 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?

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

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

Down the plane and opposite to the direction of the magnetic field (C) 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?

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

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

The electric and magnetic fields are perpendicular to each other. (B) 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?

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

What is the principle behind the Hall effect?

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

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

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

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

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

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

Perpendicular to the plane of the coil (C) Signup and view all the answers

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

2MB (D) 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?

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

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

To make the magnetic field radial (A) Signup and view all the answers

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

-MB cosθ (D) Signup and view all the answers

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

θ = 90° (D) Signup and view all the answers