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
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.
0.2 T
m = 100 g = 10-1 kg
L = 1 m
I = 5 A
For a wire balanced midway air by a magnetic field is
mg = I L B
B =
B =
⇒ B = 0.2 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