Physics

A $120kg$ dolphin decelerates from $15m/s$ to $7.5m/s$ in $5s$ to join another dolphin in play. What average force was exerted to slow the first dolphin if it was moving horizontally? (Assume that gravitational force is balanced by the buoyant force of the water)

The current in an inductor is given by $i=2+3t$  ampere where t is in second. The self?induced emf in it is $9 mV$ ; the energy stored in the inductor at t=1 second is

A current 1 flows along the length of an infinitely long, straight and thin?walled pipe. Then:

Two long conductors, separated by a distance d carry current $I_1$ and $I_2$ in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3 d. The new value of the force between them is

A neutral point is obtained at the Centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is

As the switch S is closed in the circuit shown in figure, current passed through it is

The power of a heating coil is P. It is cut into two equal parts. The power of one of them across same mains is

Before connecting the circuit shown in figure all capacitors were uncharged. The circuit now is in steady state. Now the switch $S$  is closed. During the time the steady state is reached again:

Column?I	Column?II
i. Charge on C1	p. increases
ii. Charge on C2	q. decreases
iii. Charge on C3	r. remains same
iv. Charge on C4	s. becomes zero

Now, match the given columns and select the correct option from the codes given below.

Codes:

Explain Magnetic Flux according to the Class 12 Physics Electromagnetic Induction.

What is Ohm's law in Electromagnetic Induction?