Answer: Option B. -> It will be reversed.
:
B
A current carrying conductor placed in a magnetic field experiences a force if the current and magnetic field are mutually perpendicular. The direction of this force can be found out with the help of Fleming's Left Hand Rule. However, if the direction of the current in the conductor is reversed, then the direction of the force acting on it also gets reversed, i.e. the direction of force changes by ${180}^{\circ }.$

Answer: Option A. -> True
:
A
The magnetic field produced by a current-carrying solenoid is similar to the magnetic field produced by a bar magnet. The magnetic field lines inside a solenoid is straight and equally spaced. This indicates that the strength of the magnetic field inside a solenoid is the same at all the points.

Answer: Option C. -> 2 north,2 south
:
C
If one magnet is broken into two, we always get two separate smaller magnets. Both the magnets will have their own North and the South Pole. Hence when the above magnet is broken in the middle, we get 4 poles; 2 north poles and 2 south poles.

Answer: Option A. -> Soft iron
:
A
The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing through it.
Also, this material does not retain the magnetism when the current flow is stopped. This property of soft iron is much desirablefor electromagnets.

Answer: Option A. -> Both pointing into the plane.
:
A
Applying Fleming’s left hand rule, holdingthe forefinger, middle finger, and thumb of the left hand in mutually perpendicular directions, the forefinger indicates the direction of the magnetic field and the middle finger, the direction of the current, then the thumb will indicate the direction of the force on a charge. The direction of current is always opposite to the direction of flow of electrons. With help ofFleming’s left hand rule, we can infer that the force is acting into the plane.

Answer: Option A. -> They do not intersect.
:
A
The magnetic field lines indicate the direction of magnetic field at a point. If they intersect at a point, there would be more than one direction of magnetic field which is practically not possible.

Answer: Option B. -> increase
:
B
A solenoid is a long coil containing a large number of close turns of insulated copper wire. The strength of the magnetic field produced by a current carrying solenoid depends on the nature of the core material used in making it. The use of soft iron rod as the core increases the magnetic field produced by it.

Answer: Option A. -> True
:
A
Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.

Answer: Option C. -> the bar magnet is kept stationary 
:
C
An emf would be induced inthe coil if there is a change in the magnetic flux. This can happen if the bar magnet and the coil move relative to each other i.e.if the bar magnet moves towards/away from the coil or the coil moves towards/away from the bar magnet. But if neither the bar magnet nor the coil moves then the induced current is zero.

Answer: Option C. -> 1 - North, 2- North
:
C
Magnets have two poles i.e north pole and south pole. Like poles of magnets repel each other and unlike poles attract each other. It is given that the magnets repel each other. From this, we can infer that the poles facing each other would be north-north or south-south.