Electromagnetic Induction · Physics · NEET

Let us consider two solenoids $$A$$ and $$B$$, made from same magnetic material of relative permeability $$\mu_r$$ and equal area of cross-section. Le...

An emf is generated by an ac generator having 100 turn coil, of loop area $$1 \mathrm{~m}^2$$. The coil rotates at a speed of one revolution per secon...

The net magnetic flux through any closed surface is :

The magnetic flux linked to a circular coil of radius R is $$\phi = 2{t^3} + 4{t^2} + 2t + 5$$ Wb The magnitude of induced emf in the coil at t = 5 s...

A square loop of side 1 m and resistance 1 $$\Omega$$ is placed in a magnetic field of 0.5 T. If the plane of loop is perpendicular to the direction o...

Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >> R2, the mutual inductance ...

A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around ...

In which of the following devices, the eddy current effect is not used?

A long solenoid of diameter 0.1 m has 2 $$ \times $$ 104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is plac...

A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate $${{d\overrightarrow B } \over {dt}...

A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 $$ \times \,{10^{...

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if ...

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. T...

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

In a coil of resistance 10 $$\Omega $$, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. ...

A coil of resistance 400 $$\Omega $$ is placed in a magnetic field. If the magnetic flux $$\phi $$ (Wb) linked with the coil varies with time t (sec) ...

The current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be ...

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made...

A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocit...

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop sta...

A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4...

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction $${1 \over \pi }\left( {{{Wb} \over {{m^2}}}} \right)$$ in such...

Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The m...

As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. $$V$$ volt is induced in the loop. The work don...

The magnetic flux through a circuit of resistance R changes by an amount $$\Delta $$$$\phi $$ in a time $$\Delta $$t. Then the total quantity of elect...

For a coil having L = 2 mH, current flow through it is $$I = {t^2}{e^{ - t}}$$ then, the time at which emf become zero