Alternating emf of E = 200 sin 200 π t is applied to a circuit containing an inductance of 1 π henry. Then find out Equation of instantaneous current through circuit.

The given equation, E = 200 sin 2 π t , now, compare it from the general equation, E = E 0 sin ω t it means, E 0 = 200 V Now in the case of inductive reactance, current will lag with voltage in the phase of π 2 , ⇒ i = i 0 sin ω t - π 2 ⇒ i = E 0 X L sin ω t - π 2 ⇒ i = 200 ω L sin ω t - π 2 ⇒ i = 200 200 π 1 π sin 200 π - π 2 ⇒ i = sin 200 π - π 2

Alternating emf of E = 200 sin 200 π t is applied to a circuit containing an inductance of 1 π henry. Then find out Reading of a.c. ammeter connected in the circuit.

The given equation, E = 200 sin 2 π t , now, compare it from the general equation, E = E 0 sin ω t it means, E 0 = 200 V Now in the case of inductive reactance, current will lag with voltage in the phase of π 2 , ⇒ i = i 0 sin ω t - π 2 ⇒ i = 200 ω L sin ω t - π 2 ⇒ i = sin 200 π - π 2 so the value of peak current, i 0 = 1 A , but the value of RMS current, i R M S = i 0 2 = 1 2 A

Why is the core of a transformer laminated?

Transformer core is laminated to reduce Eddy currents. Eddy currents are formed in loop. In a whole piece of iron, a big loop of Eddy current will form, which will have stronger effect. So, we laminated the core such that Eddy currents are formed in each lamina separately, of smaller size (due to increased path size of current and increased resistance). Thus energy less due to Eddy currents is reduced.

E M B I B E

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 26

MEDIUM

NEET

IMPORTANT

Earn 100

Does the current in an A.C. circuit lag, lead or remain in phase with the voltage of frequency $f$ applied to the circuit when $f = f_{r}$
where $f_{r}$ is the resonance frequency.

Important Questions on Alternating Current

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 26

Does the current in an A.C. circuit lag, lead or remain in phase with the voltage of frequency

f

applied to the circuit when

f < f_{r}

where

f_{r}

is the resonance frequency.

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 26

Does the current in an A.C. circuit lag, lead or remain in phase with the voltage of frequency

f

applied to the circuit when

f > f_{r}

where

f_{r}

is the resonance frequency.

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 27

Show mathematically that an ideal inductor does not consume any power in an a.c. circuit.

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 28

What is a transformer? Explain its theory and discuss its main uses.

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 29

A transformer has an efficiency of

80 %

and works at

100 V

and

4 kW .

If the secondary voltage is

240 V,

calculate the primary and secondary currents.

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 30

Alternating emf of $E = 200 \sin 200 π t$ is applied to a circuit containing an inductance of $(\frac{1}{π})$ henry. Then find out

Equation of instantaneous current through circuit.

MEDIUM

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 30

Alternating emf of $E = 200 \sin 200 π t$ is applied to a circuit containing an inductance of $(\frac{1}{π})$ henry. Then find out
Reading of a.c. ammeter connected in the circuit.

EASY

NEET

IMPORTANT

Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-2>Q 1

Hot wire ammeters are used for measuring-