Advertisements
Advertisements
प्रश्न
Lightning is a very good example of a natural current. In typical lightning, there is 109 J energy transfer across the potential difference of 5 × 107 V during a time interval of 0.2 s. Using this information, estimate the following quantities:
- the total amount of charge transferred between cloud and ground
- the current in the lightning bolt
- the power delivered in 0.2 s.
उत्तर
Given data: E = 109J, V = 5 × 107 V, t = 0.2s
(a) Total amount of charge-
W = qv `=> "q" = "W"/"V" = "E"/"V" = 10^9/(5 xx 10^7) = 0.2 xx 10^2`
q = 20 C
(b) current, I = `"q"/"t" = 20/0.2 = 200/2 = 100`
I = 100 A
(c) Power, P = VI = `5 xx 10^7 xx 100 = 5 xx 10^9`
APPEARS IN
संबंधित प्रश्न
ε1 and ε2 are two batteries having emf of 34V and 10V respectively and internal resistance of 1Ω and 2Ω respectively. They are connected as shown in the figure below. Using Kirchhoff’s Laws of electrical networks, calculate the currents I1 and I2.
Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (6/11) Ω?
Twelve wires, each of equal resistance r, are joined to form a cube, as shown in the figure. Find the equivalent resistance between the diagonally-opposite points a and f.
Find the equivalent resistances of the networks shown in the figure between the points a and b.
An infinite ladder is constructed with 1 Ω and 2 Ω resistors, as shown in the figure. (a) Find the effective resistance between the points A and B. (b) Find the current that passes through the 2 Ω resistor nearest to the battery.
Obtain the condition for bridge balance in Wheatstone’s bridge.
Assertion: Kirchhoff’s junction rule follows from conservation of charge.
Reason: Kirchhoff’s loop rule follows from conservation of momentum.
While measuring the length of the rod by vernier callipers, the reading on the main scale is 6.4 cm and the eight divisions on vernier is in line with marking on the main scale division. If the least count of callipers is 0.01 and zero error - 0.04 cm, the length of the rod is ______.
The e.m.f of The battery in a thermocouple is doubled. The rate of heat generated at one of the junction will.
Power P is to be delivered to a device via transmission cables having resistance RC. If V is the voltage across R and I the current through it, find the power wasted and how can it be reduced.
