Lenz’s Law

A magnet falling vertically under gravity, passes through a metal ring on its way. Which of the following is true about the acceleration $a$ of the magnet ? (where $g$ denotes the acceleration due to gravity)

Two bar magnets A and B, and a non-magnetic bar $\mathrm{C}$, all of same mass and dimensions, are dropped in an identical manner one by one through the center of a copper loop held horizontally (as shown in the figure). The times taken by the bars $A, B$, and $C$ to reach the ground are $t_A,t_B$, and $t_C$, respectively. Which of the following relations is correct?

An electron moves along the line $AB,$which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop?

A movable wire is moved to the right, that causes an anti-clock-wise induced current as shown in the figure. The direction of magnetic induction in the region P points

Lenz 's law used to find out the direction of

Lenz's law is a consequence of the law of conservation of

Two circular loops $A$ and $B$ have their planes parallel to each other, as shown in figure. Loop $A$ has a current flowing in the counterclockwise direction, viewed from above.

The figure shows a circular region of radius $R$ occupied by a time varying magnetic field $\overrightarrow{\mathrm{B}}\left(\mathrm{t}\right)$ such that $\frac{dB}{dt}<0.$ The magnitude of induced electric field at the point $P$ at a distance $r<R$ is:

A small bar magnet $A$ is falling vertically downward through a fixed horizontal conducting ring $R$ as shown. If $g$ be the acceleration due to gravity, then the acceleration of $A$ will be

Three coaxial circular wire loops and an stationary observer are positioned as shown in figure. From the observers point of view, a current I flows counter clockwise in the middle loop, which is moving towards the observer with a velocity $v.$Loops $A$ and $B$ are stationary. The same observer would notice that:

A small circular loop is suspended from an insulating thread. Another coaxial circular loop carrying a current I and having radius much larger than the first loop starts moving towards the smaller loop. The smaller loop will :

A to B are two metallic rings placed at opposite sides of an infinitely long straight conducting wire as shown. When the current in the wire is slowly decreased, what will be the direction of induced current ?

A metallic ring with a small cut is held horizontally and a magnet is then allowed to fall vertically through the ring. Then what must have been the acceleration of the magnet ?

As shown in the above figure, a magnetic field is directed into the plane of the coil $\mathrm{ABCD}$. If the field is increasing at a constant rate, then find the directions of induced currents in wires $\mathrm{AB}$ and $\mathrm{CD}$, respectively:

Consider a magnetic field along the inward normal to the plane of two coils as shown in the above figure. If the field starts diminishing, then which of the following statements does not hold good?

Consider a copper tube and an iron tube both of finite length. Now, two identical magnets are dropped along the axis of these tubes at a time. Then which of the following statements holds good?

As shown in the above figure, a magnet is pushed towards a fixed ring along its axis until the magnet passes through the ring. Now, choose the correct statement from the following:

A rod $1.6 \mathrm{c}\mathrm{m}$ long is rotate about its midpoint with a speed of $120$ revolution per minute in a plane normal to the horizontal component of earth magnetic field $H$ at a place. If $H=0.4\times {10}^{-4} \mathrm{T}$ at the place, then induced emf between the axle and the rim of the wheel is

If an iron core is inserted into the solenoid connected to a battery then the steady current flowing through the solenoid will

A circular coil of radius $8 \mathrm{c}\mathrm{m}$ , $400$ turns and resistance $2 \mathrm{\Omega }$ is placed with its plane perpendicular to the magnetic meridian.Calculate the magnitude of induced current in the coil if it rotates about its vertical diameter through 180° in $0.30 \mathrm{s}$ . Given horizontal component of earth magnetic field at the place is $3\times {10}^{-5} \mathrm{T}$ .