In an AC circuit, voltage V = V0sinωt and inductor L is connected across the circuit. Then the instantaneous power will be
C.
If is the rate of current through inductor L of any instant, then induced emf in the in the inductor of same instant is
=
To maintain the flow current in the circuit applied voltage must be equal to opposite to the induced voltage.
∴ v =
Given:- V = V0 sinωt ....(i)
∴ V0 sinωt = L
∴ sinωt
⇒ I = .....(ii)
Instantaneous power
P = V I
= [ using (i) and (ii) ]
⇒ P =
Two sinusoidal waves of intensity I having same frequency and same amplitude interferes constructively at a point. The resultant intensity at a point will be
I
2I
4I
8I
In the given circuit, the voltage across the load is maintained at 12 V. The current in the zener diode varies from 0-50 mA. What is the maximum wattage of the diode?
12 W
6 W
0.6 W
1.2 W
A photon is incident having frequency 1 x 10 sec-1. Threshold frequency of metal is 5 x 1013 sec-1. Find the kinetic energy of the ejected electron.
3.3 × 10-21 J
6.6 × 10-21 J
3.3 × 10-20 J
6.6 × 10-20 J
In given series LCR circuit R = 4Ω, XL = 5 Ω and XC = 8Ω, the current
Leads the voltage by tan-1(3/4).
Leads the voltage by tan-1(5/8)
Lags the voltage by tan-1(3/4)
Lags the voltage by tan-1(5/8)
A wire of mass 100 g, length 1 m and current 5 A is balanced in mid air by a magnetic field B, then find the value of B
0.2 T
0.1 T
0.5 T
0.6 T
A toroid with mean radius r0, diameter 2a have turns carrying current I. What is the magnetic field B outside the toroid?
zero
Which of the following parameter in the series LCR circuit is analogous to driving force F(t) in mechanics?
inductance L
capacitance C
voltage V0