In an AC circuit, voltage V = V0sinωt and inductor L is connected across the circuit. Then the instantaneous power will be
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
C.
3.3 × 10-20 J
In the photoelectric effect, the incident photon's energy is utilized in ejecting the electron and remnant energy is the kinetic energy of the electron
The relation between kinetic energy and threshold frequency of photon is given as
where h - Planck's constant
ν - incident frequency
ν0 - threshold frequency
We know that
h = 6.63 × 10-34 J s
ν = 1.0 × 1014 sec-1
ν0 = 5 ×1013 sec-1
K.E = 6.63 × 10-34 × (1.0 × 1014 sec-1 5 ×1013 sec-1 )
= 6.63 × 10-34 J.s × 0.5 × 1014 sec-1
⇒ K.E = 3.3 × 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