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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
In potentiometer experiment, if l1 is the balancing length for e.m.f. of cell of internal resistance r and l2 is the balancing length for its terminal potential difference when shunted with resistance R then :
Concept: Metre Bridge: Slide-Wire Bridge
The instrument which can measure terminal potential difference as well as electromotive force (e.m. f.) is ______
- Wheatstone’s meter bridge
- Voltmeter
- Potentiometer
- Galvanometer
Concept: Metre Bridge: Slide-Wire Bridge
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
State any ‘two’ possible sources of errors in meter-bridge experiment. How can they be minimised?
Concept: Metre Bridge: Slide-Wire Bridge
A potentiometer wire has resistance of per unit length of 0.1 Ω/m. A cell of e.m.f. 1.5 V balances against a 300 cm length of the wire. Find the current in the potentiometer wire.
Concept: Potentiometer
Kirchhoff's voltage law and current law are respectively in accordance with the conservation of .................................. .
- charge and momentum
- charge and energy
- energy and charge
- energy and momentum
Concept: Kirchhoff’s Laws
