Recent questions tagged additional quest

A magnetic field of 10T acts normal to a coil of 50 turns having $100 cm^2$ area. Find emf induced if the coil is removed from magnetic field in 0.1 sec.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A circular copper disc 10 cm in radius rotates at $20\pi$ rad/s about an axis through its centre and perpendicular to its disc. A uniform magnetic field of 0.2T acts perpendicular to the disc. Calculate the induced current if the resistance of the disc is $2\Omega$.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A circular copper disc 10 cm in radius rotates at $20\pi$ rad/s about an axis through its centre and perpendicular to its disc. A uniform magnetic field of 0.2T acts perpendicular to the disc. Calculate the potential difference developed between the axis of the disc and the rim.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A wheel with 50 metallic spokes each 0.5 m long is rotated with an angular speed of 12 radian /sec, in a plane normal to the earth's magnetic field. If the magnitude of the field is $ 0.5 \times 10^{-4}$ T, calculate the emf induced between the axle and the rim of the wheel.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of $ 50 rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. Calculate the average emf.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of 50 $rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. Calculate the maximum emf induced in the coil.

asked Dec 30, 2016 by suganyadevi.p

1 answer

Write a expression for mutual inductance of two coaxial solenoids.

asked Dec 30, 2016 by suganyadevi.p

1 answer

Why are resistance coils usually double wound?

asked Dec 30, 2016 by suganyadevi.p

1 answer

The rate of charge of magnetic flux has same units as induced e.m.f. Say true or false.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A magnetic field of flux density $1.0 wb m^{-2}$ acts normal to a 80 turn coil of 0.01 m^2 area. Find the e.m.f induced in it, if this coil is removed from the field in 0.1 second.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A conducting circular loop is placed in a uniform magnetic field B = 0.020 T with its plane perpendicular to the field. The radius of the loop starts shrinking at a constant rate of 1.0 mm/s. Find the induced e.m.f in the loop at an instant when the radius is 2cm?

asked Dec 30, 2016 by suganyadevi.p

1 answer

A conducting wire of 100 turns is wound over 1cm near the centre of a solenoid of 100 cm length and 2 cm radius having 1000 turns. Calculate the coefficient of mutual inductance of the two solenoids.

asked Dec 30, 2016 by suganyadevi.p

1 answer

SI unit of magnetic flux is

asked Dec 30, 2016 by suganyadevi.p

1 answer

A wire of length 2m moves with a speed of 5 m/s perpendicular to a magnetic field of induction $0.1 wb/m^2$. The emf induced in the wire is

asked Dec 30, 2016 by suganyadevi.p

1 answer

Amount of change induced in a circuit of resistance R is given by

asked Dec 30, 2016 by suganyadevi.p

1 answer

A solenoid coil has 50 turns per cm along its length and a cross sectional area of $4cm^2$, 200 turns of another wire are wound round the first solenoid co-axially. The two coils are electrically insulated from each other. Calculate the mutual inductance between the two coils.

asked Dec 30, 2016 by suganyadevi.p

1 answer

Two coils have mutual inductance of 1.5 henry. If current in primary circuit is raised to 5 ampere in one millisecond after closing the circuit, what is the e.m.f induced in the secondary??

asked Dec 30, 2016 by suganyadevi.p

1 answer

An e.m.f of 250 microvolt in induced in a coil when current in it changes from 10A to 6A in 0.4 second. What is the self inductance of the coil?

asked Dec 30, 2016 by suganyadevi.p

1 answer

As soon as current is switched on a high voltage line, the bird sitting on it flies away. Why??

asked Dec 30, 2016 by suganyadevi.p

1 answer

The magnetic flex through a coil perpendicular to its plane and directed into paper is varying according to the relation $\phi = (5t^2 + 10t + 5)$ milliwebers. Calculate the e.m.f induced in the loop.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A 2m long solenoid with diameter 4 cm and 2000 turns has a secondary of 1000 turns wound closely near it mid point. Calculate the mutual inductance between the two coils.

asked Dec 30, 2016 by suganyadevi.p

1 answer

An aircraft with a wingspan of 40m flies with a speed of 1080 $km hr^{-1}$ in the eastward direction at a constant altitude in the northern hemisphere where the vertical component of earth's magnetic field is $1.75 \times 10^{-5} T$. Find the emf that develops between the tips of the wings.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A 12v battery connected to a $6 \Omega$, 10H coil through a switch drives a constant current in the circuit. Th switch is suddenly opened. Assuming that it took 1 millisecond to open the switch. Calculate the average e.m.f induced across the coil.

asked Dec 30, 2016 by suganyadevi.p

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