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 toroid with mean radius r0, diameter 2a have turns carrying current I. What is the magnetic field B outside the toroid?
zero
D.
zero
(i) Inside the toroidal solenoid
B = μ0 nI
here n =
N = total number of turns
(ii) The magnetic field at any point inside the toroid is 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