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The role of inductance is equivalent to ______
Concept: Induction and Energy Transfer
In the expression e = –dΦ/dt, the -ve sign signifies ______
Concept: Induced Emf in a Stationary Coil in a Changing Magnetic Field
Distinguish between Step up and Step Down Transformer.
Concept: Transformers
A plane of a coil of 10 turns is tightly wound around a solenoid of diameter 2 cm having 400 turns per centimeter. The relative permeability of the core is 800. Calculate the inductance of the solenoid.
Concept: Induction and Energy Transfer
Obtain an expression for the self-inductance of a solenoid.
Concept: Inductance >> Self Inductance
Find an expression for the power expended in pulling a conducting loop out of a magnetic field.
Concept: Energy Stored in a Magnetic Field
Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
Concept: Energy Stored in a Magnetic Field
An emf of 91 mV is induced in the windings of a coil when the current in o nearby coil is increasing at the rate of 1.3 A/s. what is the mutual inductance (M) of the two coils in mH?
Concept: Inductance >> Mutual Inductance
Derive an expression for energy stored in the magnetic field in terms of induced current.
Concept: Energy Stored in a Magnetic Field
A wire 5 m long is supported horizontally at a height of 15 m along an east-west direction. When it is about to hit the ground, calculate the average e.m.f. induced in it. (g = 10 m/s2)
Concept: Motional Electromotive Force (e.m.f.)
Derive the equation for a transformer.
Concept: Transformers
An aircraft of wing span of 60 m flies horizontally in earth’s magnetic field of 6 × 10−5 T at a speed of 500 m/s. Calculate the e.m.f. induced between the tips of the wings of the aircraft.
Concept: Motional Electromotive Force (e.m.f.)
The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.
Concept: Inductance >> Self Inductance
Discuss the composition of two S.H.M.s along the same path having same period. Find the resultant amplitude and intial phase.
Concept: LC Oscillations
Obtain an expression for average power dissipated in a purely resistive A.C. circult.
Concept: Power in AC Circuit
Two diametrically opposite points of a metal ring are connected to two terminals of the left gap of meter bridge. The resistance of 11 Ω is connected in right gap. If null point is obtained at a distance of 45 cm from the left end, find the resistance of metal ring.
Concept: Meter Bridge
An unknown resistance is placed in the left gap and resistance of 50 ohm is placed in the right gap of a meter bridge. The null point is obtained at 40 cm from the left end. Determine the unknown resistance.
Concept: Meter Bridge
When unknown resistance is determined by meter bridge, the error due to contact resistance
is minimized ______.
(A) by connecting both the resistances only in one gap.
(B) by interchanging the positions of known and unknown resistance.
(C) by using uniform wire.
(D) by obtaining the null point near the ends of the wire.
Concept: Meter Bridge
