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Lenz’s Law And Conservation Of Energy MDCAT MCQs with Answers

Lenz’s Law And Conservation Of Energy MDCAT MCQs

Welcome to the Lenz’s Law And Conservation Of Energy MDCAT MCQs with Answers. In this post, we have shared Lenz’s Law And Conservation Of Energy Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding Lenz’s Law And Conservation Of Energy MCQs in this MDCAT Online Test.

Lenz’s Law And Conservation Of Energy MDCAT MCQs Test Preparations

Lenz’s Law states that the direction of the induced current is such that it:
a) Opposes the cause of its production
b) Aids the cause of its production
c) Is random
d) Is perpendicular to the magnetic field

Answer
a) Opposes the cause of its production

According to the principle of conservation of energy, energy can:
a) Neither be created nor destroyed
b) Be created from nothing
c) Be destroyed completely
d) Be converted into mass

Answer
a) Neither be created nor destroyed

Lenz’s Law ensures that the induced EMF opposes the change in magnetic flux, which is consistent with:
a) Conservation of energy
b) Conservation of momentum
c) Conservation of charge
d) Conservation of mass

Answer
a) Conservation of energy

When a magnet is moved towards a coil, the induced current in the coil creates a magnetic field that:
a) Opposes the magnet’s motion
b) Supports the magnet’s motion
c) Is neutral
d) Increases the speed of the magnet

Answer
a) Opposes the magnet’s motion

The negative sign in Faraday’s law of induction (E = -dΦ/dt) represents:
a) The direction of induced EMF as per Lenz’s Law
b) The magnitude of induced EMF
c) The energy dissipation
d) The phase difference between voltage and current

Answer
a) The direction of induced EMF as per Lenz’s Law

The opposing nature of induced current in Lenz’s Law indicates that the system will:
a) Conserve energy
b) Lose energy
c) Gain energy
d) Convert energy into mass

Answer
a) Conserve energy

If the magnetic flux through a coil increases, the induced current will:
a) Flow in a direction to oppose the flux increase
b) Flow in a direction to increase the flux further
c) Not be generated
d) Be randomly directed

Answer
a) Flow in a direction to oppose the flux increase

Lenz’s Law is a direct consequence of which fundamental principle?
a) Newton’s Third Law
b) Conservation of charge
c) Conservation of energy
d) Conservation of momentum

Answer
c) Conservation of energy

The induced EMF in a coil due to a changing magnetic field will:
a) Oppose the change in magnetic field
b) Support the change in magnetic field
c) Remain unaffected
d) Cause an increase in the magnetic field

Answer
a) Oppose the change in magnetic field

Lenz’s Law helps in:
a) Determining the direction of induced current
b) Calculating the magnitude of current
c) Measuring the resistance of a circuit
d) Increasing the voltage across a resistor

Answer
a) Determining the direction of induced current

In an electric generator, the induced EMF due to the movement of the coil in a magnetic field opposes the applied mechanical work. This is an application of:
a) Lenz’s Law and Conservation of Energy
b) Newton’s Second Law
c) Ohm’s Law
d) Kirchhoff’s Law

Answer
a) Lenz’s Law and Conservation of Energy

Lenz’s Law states that the induced current will flow in a direction that opposes:
a) The change in magnetic flux
b) The existing magnetic field
c) The electric field
d) The velocity of the charge carriers

Answer
a) The change in magnetic flux

According to Lenz’s Law, the direction of induced current in a closed loop due to a changing magnetic field is such that it creates:
a) A magnetic field opposing the original change
b) A magnetic field aiding the original change
c) A parallel electric field
d) No magnetic field

Answer
a) A magnetic field opposing the original change

The conservation of energy in an electromagnetic system ensures that the total energy remains:
a) Constant
b) Increasing
c) Decreasing
d) Zero

Answer
a) Constant

When the magnetic flux through a coil changes, the induced EMF works to:
a) Oppose the flux change
b) Enhance the flux change
c) Have no effect
d) Increase the temperature of the coil

Answer
a) Oppose the flux change

Lenz’s Law provides a physical interpretation of:
a) The conservation of energy in electromagnetic processes
b) The generation of magnetic fields
c) The movement of electric charges
d) The distribution of electric fields

Answer
a) The conservation of energy in electromagnetic processes

The phenomenon of electromagnetic induction respects the law of conservation of energy by ensuring that:
a) The induced EMF opposes the cause of induction
b) The induced current supports the change in flux
c) The energy is created in the circuit
d) The magnetic field is constant

Answer
a) The induced EMF opposes the cause of induction

The energy converted from mechanical to electrical form in a generator is consistent with:
a) Lenz’s Law
b) Faraday’s Law
c) Ampere’s Law
d) Coulomb’s Law

Answer
a) Lenz’s Law

In a transformer, the conservation of energy is maintained because:
a) The input power equals the output power, accounting for losses
b) The input power is less than the output power
c) The input power is greater than the output power
d) There is no energy conversion

Answer
a) The input power equals the output power, accounting for losses

When a conductor moves through a magnetic field, the work done in moving the conductor is converted into:
a) Electrical energy
b) Kinetic energy
c) Thermal energy
d) Potential energy

Answer
a) Electrical energy

The opposing EMF generated in an inductive circuit is due to:
a) Lenz’s Law
b) Ohm’s Law
c) Coulomb’s Law
d) Gauss’s Law

Answer
a) Lenz’s Law

Lenz’s Law can be used to predict the:
a) Direction of induced current
b) Magnitude of magnetic flux
c) Electric field strength
d) Number of charge carriers

Answer
a) Direction of induced current

Lenz’s Law and the principle of conservation of energy are demonstrated in:
a) Eddy currents
b) Superconductors
c) Insulators
d) Capacitors

Answer
a) Eddy currents

When a magnetic field through a loop increases, the induced current flows in a direction that:
a) Produces a magnetic field opposing the increase
b) Supports the increase
c) Increases the loop’s area
d) Causes the magnetic field to remain constant

Answer
a) Produces a magnetic field opposing the increase

The work done against the induced EMF in a moving conductor is converted into:
a) Electrical energy
b) Thermal energy
c) Kinetic energy
d) Chemical energy

Answer
a) Electrical energy

In an electric motor, Lenz’s Law ensures that:
a) The rotor moves in the direction opposite to the magnetic force
b) The rotor speed is directly proportional to the current
c) The system conserves energy
d) The motor generates more energy than it consumes

Answer
c) The system conserves energy

In an electromagnetic system, Lenz’s Law provides:
a) A method to calculate the energy conversion efficiency
b) A technique to generate excess energy
c) A way to store electrical energy
d) A means to eliminate energy loss

Answer
a) A method to calculate the energy conversion efficiency

The opposition of the induced current to the applied magnetic field change in a coil demonstrates:
a) Lenz’s Law and energy conservation
b) Kirchhoff’s Laws
c) Maxwell’s Equations
d) The photoelectric effect

Answer
a) Lenz’s Law and energy conservation

In a superconducting loop, an induced current due to a changing magnetic field will:
a) Persist indefinitely
b) Dissipate quickly
c) Generate heat
d) Increase the loop’s resistance

Answer
a) Persist indefinitely

In a generator, Lenz’s Law causes:
a) A drag force opposing the motion
b) An accelerating force
c) An increase in mechanical energy
d) A decrease in resistance

Answer
a) A drag force opposing the motion

The principle of conservation of energy in an electromagnetic system states that:
a) The total energy remains constant
b) Energy is created
c) Energy is destroyed
d) Magnetic energy is always zero

Answer
a) The total energy remains constant

Lenz’s Law is crucial in understanding the functioning of:
a) Induction cooktops
b) Light-emitting diodes
c) Solar cells
d) Chemical batteries

Answer
a) Induction cooktops

The opposing force experienced when moving a conductor through a magnetic field is due to:
a) Lenz’s Law
b) Coulomb’s Law
c) Ampere’s Law
d) Faraday’s Law

Answer
a) Lenz’s Law

Lenz’s Law helps in maintaining:
a) The conservation of energy
b) The generation of energy
c) The destruction of energy
d) The conservation of momentum

Answer
a) The conservation of energy

The principle that energy can neither be created nor destroyed but only transformed is demonstrated by:
a) Lenz’s Law
b) Ohm’s Law
c) Coulomb’s Law
d) Pascal’s Law

Answer
a) Lenz’s Law

In electromagnetic braking, the braking force is due to:
a) Lenz’s Law
b) Newton’s First Law
c) Archimedes’ Principle
d) Bernoulli’s Principle

Answer
a) Lenz’s Law

The existence of Lenz’s Law ensures that an induced current always opposes:
a) The change that produced it
b) The direction of the magnetic field
c) The electric field
d) The temperature gradient

Answer
a) The change that produced it

In a circuit, the work done against the induced EMF is stored as:
a) Magnetic energy
b) Thermal energy
c) Potential energy
d) Kinetic energy

Answer
a) Magnetic energy

The conservation of energy in an electromagnetic system prevents:
a) Perpetual motion machines
b) Efficient energy transfer
c) Energy conversion
d) Magnetic flux change

Answer
a) Perpetual motion machines

The direction of induced current as per Lenz’s Law ensures:
a) Energy is not created out of nothing
b) Energy is maximized
c) Energy is dissipated
d) Energy is amplified

Answer
a) Energy is not created out of nothing

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