MCQs Class 12 Physics Chapter 4 Moving Charges and Magnetism

Quiz

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Magnetic field at any point inside the straight solenoid is given as:	B = μ0nI B = μ0+nI B = μ0/nI None
Lorentz force is given by the formula:	F = q(v – B – E) F = q(v + B + E) F = q(v * B * E) F = q(v * B + E)
The magnetic moment of a current I carrying a circular coil of radius r and number of turns N varies as:	r² 1/r² r³ None
A 200 turn closely wound circular coil of radius 15 cm carries a current of 4 A. The magnetic moment of this coil is:	36.5 A m² 56.5 A m² 65.5 A m² 12 A m²
When the charged particles move in a combined magnetic and electric field, the force acting is known as:	Centripetal force Centrifugal force Lorentz force Orbital force
Magnetic field at the center of a circular current loop of radius R is proportional to:	1/R R² 1/R² R³
The direction of the magnetic field due to a current-carrying conductor can be determined using:	Fleming's Left-Hand Rule Right-Hand Thumb Rule Ampere’s Law Faraday’s Law
The SI unit of magnetic flux is:	Tesla Weber Ampere Henry
Faraday’s Law of Electromagnetic Induction states that the induced EMF is proportional to:	The rate of change of magnetic flux The magnetic field strength The electric field strength The velocity of the charged particle
A moving charge in a magnetic field experiences a force that is:	Parallel to the magnetic field Perpendicular to both velocity and magnetic field Opposite to the direction of motion Parallel to the velocity of the particle
Which of the following is true for a charged particle moving in a magnetic field?	The magnetic force does no work on the particle The particle gains kinetic energy The magnetic field increases the speed of the particle The magnetic force accelerates the particle in the direction of the field
The magnetic field outside a long straight current-carrying conductor is:	Inversely proportional to the distance from the conductor Directly proportional to the distance from the conductor Independent of the distance Proportional to the square of the distance from the conductor
A solenoid is a type of:	Permanent magnet Electromagnet Static charge Ferromagnetic material
When a current-carrying conductor is placed in a magnetic field, the force on the conductor is maximum when the angle between the current and the magnetic field is:	90 degrees 0 degrees 45 degrees 180 degrees
The magnetic flux through a surface is zero when the magnetic field is:	Parallel to the surface Perpendicular to the surface At an angle of 45 degrees to the surface None of the above
Which law states that the induced current will oppose the change in magnetic flux that produced it?	Lenz’s Law Faraday’s Law Ampere’s Law Coulomb’s Law
The magnetic field inside a long straight solenoid carrying current is:	Zero Uniform Increasing towards the center Decreasing towards the center
The force per unit length between two parallel current-carrying conductors is proportional to:	The product of their velocities The product of their currents The square of their currents The inverse of their currents
The phenomenon in which an induced current is produced due to a changing magnetic field is called:	Electromagnetic Induction Magnetic Resonance Electric Potential Magnetic Flux
The magnitude of the magnetic force on a charged particle moving through a magnetic field is zero when:	The particle moves parallel to the magnetic field The particle moves perpendicular to the magnetic field The velocity of the particle is very high The velocity of the particle is very low

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