Arrange the following electromagnetic radiation in the order of decreasing energy.
A. Infrared waves B. Ultraviolet rays
C. Orange light D. Green light
B, C, A, D
D, A, C, B
B, D, C, A
A, C, D, B
In the circuit, shown in figure, K is open. The charge on capacitor C in steady state is q. Now, key is closed and at steady state, the charge on C is q2 the ratio of charges is
1
When an AC source of emf e = E0 sin (100t) is connected across a circuit, the phase difference between the emf e and the current i in the circuit is observed to be /4, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C is series, find the relationship between the two elements.
R = 1 kΩ , C = 10 µF
R = 1 kΩ , C = 1 µF
R = 1 kΩ , L = 10 H
R = 1 kΩ , L = 1 H
Three solenoid coils of same dimensions, same number of turns and same number of layers of windings are taken. Coil 1 with inductance L1 was wound using a wire of resistance 11 Ω /m, coil 2 with inductance L2 was wound using the similar wire but the direction of winding was reversed in each layer, coil 3 with inductance L3 was wound using a superconducting wire. The self inductance of the coils L1 , L2 and L3 are
L1 = L2 = L3
L1 = L2 , L3 = 0
L1 = L3 , L2 = 0
L1 > L2 > L3
A long hollow conducting cylinder is kept co-axially inside another long and hollow conducting cylinder of larger radius. Both the cylinders are initially electrically neutral.Now consider the following statements
Which of the above mentioned statement is/are correct?
Only I
I, IV
Only II
Only III
A.
Only I
When a charge density is given to inner cylinder an electric field will produced b/w the inner cylinder and outer cylinder.
Hence, a potential difference will appear between two cylinders.
An iron rod of volume 10-4 m3 and relative permeability 1000 is placed inside a long solenoid having 5 turns/cm. If a current of 5.0 A is passed through the solenoid, then magnetic moment of the rod is
20 A-m2
25 A-m2
30 A-m2
35 A-m2
Two electric bulbs rated 50W and 100W are glowing at full power, when used in parallel with a battery of emf 120 V and internal resistance 10 Ω. The maximum number of bulbs that can be connected in the circuit when glowing at full power is
6
4
2
8
A LED has a voltage drop of 2V across it and passes a current of 10 mA. When it operates with a 6V battery through a limiting resistor R. The value of R is
40 kΩ
200 Ω
4 kΩ
400 Ω
In a region, the potential is represented by V (x,y,z) = 6x − 8xy − 8y + 6yz where V is in volts and x,y,z are in meters. The electric force experienced by a charge of 2C situated at point (1,1,1) is
30 N
24 N