24. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in (a)P increases while in Q decreases (b)Q increases while in P decreases (c)both P and Q increases (d) both Pand Q decreases

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Q. Two identical coaxial coils

P

and

Q

carrying equal amount of current in the same direction are brought nearer. The current in

Q. In mutual induction
A: when current in one coil increases, induced current in neighbouring coil flows in the opposite direction
B: When current in one coil decreases, induced current in neighbouring coil flows in the opposite direction

Q. Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is situated while moving from A to B. The potential
(a) continuously increases
(b) continuously decreases
(c) increases then decreases
(d) decreases then increases

Q. Three identical coils

A, B, C

carrying currents are placed coaxially with their planes parallel to one another.

A

and

C

carry currents as shown in figure.

B

is kept fixed, while

A

and

C

both are moved toward

B

with the same speed. Initially,

B

is equally separated from

A

and

C

. The direction of the induced current in the coil

B

is :

On reversing the direction of current in a wire, the magnetic field produced by it:
(a) gets reversed in direction
(b) increases in strength
(c) decreases in strength
(d) remains unchanged in strength and direction.

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