Lenz's Law, Eddy Currents & Induced Electric Field

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)increase in both
• (b)decrease in both
• (c)remain unchanged
• (d)increase in one coil and decrease in second coil

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)less than $g$
• (b)greater than $g$
• (c)equal to $g$
• (d)zero

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)less than $9.8$ m/s$^{2}$
• (b)greater than $9.8$ m/s$^{2}$
• (c)equal to $9.8$ m/s$^{2}$
• (d)equal to 'h' m/s$^{2}$

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)Time taken by them to reach the earth's surface will be independent of the properties of their materials.
• (b)Insulating ball will reach the earth's surface earlier than the metal ball.
• (c)Both will reach the earth's surface simultaneously.
• (d)Metal ball will reach the earth's surface earlier than the insulating ball.

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)$C_1$ and $C_3$ move with equal speeds away from $C_2$
• (b)$C_1$ moves towards $C_2$ and $C_3$ moves away from $C_2$
• (c)$C_1$ and $C_3$ move with equal speeds towards $C_2$
• (d)$C_1$ moves away from $C_2$ and $C_3$ moves towards $C_2$

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)Kirchhoff's $1$st law in electricity.
• (b)Lenz's law in induction.
• (c)Ampere's circuital law.
• (d)Gauss's law in electrostatics.

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)g
• (b)less than g
• (c)more than g
• (d)zero

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)more than acceleration due to gravity.
• (b)less than acceleration due to gravity.
• (c)depends on the diameter of ring and length of magnet.
• (d)depends on pole strength of magnet.

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)plate ' $a$ '
• (b)plate ' $b$ '
• (c)both plates 'a' and 'b'
• (d)neither plate ' $a$ ' nor plate ' $b$ '

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)induced current in the coil is zero.
• (b)induced current in the coil is anticlockwise.
• (c)induced current in the coil is clockwise.
• (d)ring will come to rest.

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)zero.
• (b)proportional to V.
• (c)proportional to $\text{V}^{-1}$.
• (d)finite but does not depend on V.

Lenz's Law, Eddy Currents & Induced Electric Field · Induced electric field

• (a)A-III, B-IV, C-I, D-II
• (b)A-IV, B-II, C-III, D-I
• (c)A-II, B-III, C-IV, D-I
• (d)A-I, B-III, C-IV, D-II

Lenz's Law, Eddy Currents & Induced Electric Field · Induced electric field

• (a)A-IV, B-III, C-I, D-II
• (b)A-I, B-II, C-III, D-IV
• (c)A-IV, B-I, C-III, D-II
• (d)A-II, B-III, C-I, D-IV

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)equal to g.
• (b)less than $g$.
• (c)more than g.
• (d)zero.

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)move down with almost constant speed
• (b)move down with an acceleration equal to $g$
• (c)move down with an acceleration greater than $g$
• (d)oscillate inside the tube

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)Metal ball will reach the earth's surface earlier than the insulating ball
• (b)Both will reach the earth's surface simultaneously.
• (c)Insulating ball will reach the earth's surface earlier than the metal ball
• (d)Time taken by them to reach the earth's surface will be independent of the properties of their materials

Lenz's Law, Eddy Currents & Induced Electric Field · Eddy currents

• (a)to bring the coil to rest quickly
• (b)to produce large deflecting torque on the coil
• (c)to oscillate the coil in magnetic field for longer period of time
• (d)to make the magnetic field radial

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)$e$
• (b)$2e$
• (c)$\frac{e}{2}$
• (d)$4e$

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)A is true but R is false
• (b)A is false but R is true
• (c)Both A and R are true but R is NOT the correct explanation of A
• (d)Both A and R are true and R is the correct explanation of A

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)clockwise
• (b)anticlockwise
• (c)in a direction which depends on the ratio of the loop radii.
• (d)zero

Lenz's Law, Eddy Currents & Induced Electric Field · Eddy currents

• (a)a thick metal plate is kept in a steady magnetic field
• (b)a circular coil is placed in a steady magnetic field
• (c)a steady current is passed through a coil
• (d)a thick metal plate is kept in a varying magnetic field

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)Outward and decreasing with time
• (b)Parallel to the plane of coil and decreasing with time
• (c)Outward and increasing with time
• (d)Parallel to the plane of coil and increasing with time

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)
• (b)
• (c)
• (d)

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)
• (b)
• (c)
• (d)

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)
• (b)
• (c)
• (d)

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)Direction of IR remains unchanged and VR is zero at t = 0.25
• (b)Direction of IR remains unchanged and VR is maximum at t = 0.5
• (c)At t = 0.25 direction of IR reverses and VR is maximum
• (d)At t = 0.5 direction of IR reverses and VR is zero

Lenz's Law, Eddy Currents & Induced Electric Field · Eddy currents

• (a)magnetic braking in train
• (b)electromagnet
• (c)electric heater
• (d)induction furnace

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)
• (b)
• (c)
• (d)

Lenz's Law, Eddy Currents & Induced Electric Field · Induced electric field

• (a)zero in loop 1 and zero in loop 2
• (b)$-\frac{d\vec{B}}{dt}\pi r^{2}$ in loop 1 and $-\frac{d\vec{B}}{dt}\pi r^{2}$ in loop 2
• (c)$-\frac{d\vec{B}}{dt}\pi R^{2}$ in loop 1 and zero in loop 2
• (d)$-\frac{d\vec{B}}{dt}\pi r^{2}$ in loop 1 and zero in loop 2

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)The current will reverse its direction as the electron goes past the coil
• (b)No current induced
• (c)abcd
• (d)adcb

Lenz's Law, Eddy Currents & Induced Electric Field · Induced electric field

• (a)
• (b)
• (c)
• (d)

Lenz's Law, Eddy Currents & Induced Electric Field · Eddy currents

• (a)development of air current when the plate is placed
• (b)induction of electrical charge on the plate
• (c)shielding of magnetic lines of force as aluminium is a para-magnetic material.
• (d)electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.

Lenz's Law, Eddy Currents & Induced Electric Field · Induced electric field

• (a)QV
• (b)2QV
• (c)QV/2
• (d)zero

Lenz's Law, Eddy Currents & Induced Electric Field · Magnet falling through a ring or pipe

• (a)more than $g$
• (b)equal to $g$
• (c)less than $g$
• (d)either (1) or (3)

Lenz's Law, Eddy Currents & Induced Electric Field · Lenz's law and direction of current

• (a)energy
• (b)energy and magnetic field
• (c)charge
• (d)magnetic field

Lenz's Law, Eddy Currents & Induced Electric Field · Eddy currents

• (a)a metal is kept in varying magnetic field
• (b)a metal is kept in steady magnetic field
• (c)a circular coil is placed in a magnetic field
• (d)through a circular coil, current is passed