Electromagnetic Induction · Physics · KCET

In the figure, a conducting ring of certain resistance is falling towards a current carrying straight long conductor. The ring and conductor are in the same plane. Then, the

An induced current of 2 A flows through a coil. The resistance of the coil is $10 \Omega$. What is the change in magnetic flux associated with the coil in 1 ms ?

A square loop of side length $a$ is moving away from an infinitely long current carrying conductor at a constant speed $v$ as shown. Let $x$ be the instantaneous distance between the long conductor and side $A B$. The mutual inductance $M$ of the square loop-long conductor pair changes with time $t$ according to which of the following graphs?

A square loop of side $$2 \mathrm{~cm}$$ enters a magnetic field with a constant speed of $$2 \mathrm{~cm} \mathrm{~s}^{-1}$$ as shown. The front edge enters the field at $$t=0 \mathrm{~s}$$. Which of the following graph correctly depicts the induced emf in the loop?

(Take clockwise direction positive)

The current in a coil changes from $$2 \mathrm{~A}$$ to $$5 \mathrm{~A}$$ in $$0.3 \mathrm{~s}$$. The magnitude of emf induced in the coil is $$1.0 \mathrm{~V}$$. The value of self-inductance of the coil is

A metallic rod of length $$1 \mathrm{~m}$$ held along east-west direction is allowed to fall down freely. Given horizontal component of earth's magnetic field $$B_H=3 \times 10^{-5} \mathrm{~T}$$. the emf induced in the rod at an instant $$t=2 \mathrm{~s}$$ after it is released is

(Take, $$g=10 \mathrm{~ms}^{-2}$$ )

A long solenoid has 500 turns, when a current of $$2 \mathrm{~A}$$ is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $$4 \times 10^{-3} \mathrm{~Wb}$$, then self induction of the solenoid is

A magnetic field of flux densiity $$1.0 \mathrm{~Wb} \mathrm{~m}^{-2}$$ acts normal to a 80 turn coil of $$0.01 \mathrm{~m}^2$$ area. If this coil is removed from the field in $$0.2 \mathrm{~s}$$, then the emf induced in it is

The physical quantity which is measure in the unit of wb $$\mathrm{A}^{-1}$$ is

The current following through an inductance coil of self-inductance $$6 \mathrm{~mH}$$ at different time instants is as shown. The emf induced between $$t=20 \mathrm{~s}$$ and $$t=40 \mathrm{~s}$$ is nearly

A rod of length $$2 \mathrm{~m}$$ slides with a speed of $$5 \mathrm{~ms}^{-1}$$ on a rectangular conducting frame as shown in figure. There exists a uniform magnetic filed of $$0.04 \mathrm{~T}$$ perpendicular to the plane of the figure. If the resistance of the rod is $$3 \Omega$$. The current through the rod is

The current in a coil of inductance $$0.2 \mathrm{H}$$ changes from $$5 \mathrm{~A}$$ to $$2 \mathrm{~A}$$ in $$0.5 \mathrm{~s}$$. The magnitude of the average induced emf in the coil is

Consider the situation given in figure. The wire $$A B$$ is slid on the fixed rails with a constant velocity. If the wire $$A B$$ is replaced by a semicircular wire, the magnitude of the induced current will