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

A bar magnet is passing through a conducting loop of radius $R$ with velocity $v.$ The radius of the bar magnet is such that it just passes through the loop. The induced e.m.f. in the loop can be represented by the approximate curve:

Lenz's law is in accordance with the law of:

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?

A square conducting loop is placed near an infinitely long current-carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddenly halved, which of the following statements will be true?
"The loop will "
 

Current from A to B in the straight wire is decreasing. The direction of induced current in circular loop will be :

The diagram below shows two circular loops of wire $A$ and $B$ centered on and perpendicular to the $x$-axis, and oriented with their planes parallel to each other. The $y$-axis passes vertically through loop $A$ (dashed line). There is a current $I_B$ in loop $B$ as shown. Possible actions which we might perform on loop $A$ are

(i) Move $A$ to the right along $x$-axis closer to $B$.
(ii) Move $A$ to the left along $x$-axis away from $B$.
(iii) As viewed from above, rotate $A$ clockwise about $y$-axis.
(iv) As viewed from above, rotate $A$ anticlockwise about $y$-axis Which of these actions will induce a current in $A$ only in the direction shown.

A copper ring having a cut such that it does not form a complete loop is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. Then acceleration of the falling magnet is