Given light as described by El Ege x w where E is the

A cell can be balanced against 110 cm and 100 cm of potentiometer wire respectively with and without being short circuited through a resistance of 10 Q2 Its internal resistance is a 2 0 ohm c 1 0 ohm b zero d 0 5 ohm

If an electrion is placed in a uniform electric field then the electron will 1 experience no force 2 moving with constant velocity in the direction of the filed 3 move with constant velocity in the direction opposite to the field 4 accelerate in direction opposite to field

6 In the EM wave the amplitude of magnetising field H and the amplitude of electric field E at any place are related as 1 H Eo 3 H Eo Ho 2 Ho E C 4 H E Eo

3 0 3 If and E are current density and electric field respectively inside a current carrying conductor then corred relation is 1 GE 3 j 0 2 jxE 0 4 All of these

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is The frequency of the microwaves has no relation with natural frequency of water molecules Microwaves are heat waves so always produce heating Infrared waves produce heating in a microwave oven The frequency of the microwaves must match the resonant frequency of the water molecules

12 A parallel plate capacitor with ci radius a is being charged as shown in the figure At the instant shown the displacement current in the to region between the plates enclosed between a is given by Id 000 2 1 i 3 8 8 4 100 TO 9 3 POIA

Two circular plates of radius 0 2 m are used to form a parallel plate capacitor displacement current between the plates is ampere then the magnetic field produced by displacement current at 0 1 m from the axis of the plate will be 5 x 10 7 T 4 x 10 7 T 5 x 10 6 T axis of the plate

Which of the following is true 1 Lyman series is a continuous spectrum 2 Paschen series is a line spectrum in the infrared c 3 Balmer series is a line spectrum in the ultraviolet 4 The spectral series formula can be derived from the Rutherford model of the hydrogen atom

Light with intensity 18 W cm falls on non reflecting surface at normal incidence If surface has an area of 20 cm2 find the average power exertec surface during time span of one minute 0 1 2 x 10 6 N 2 4 x 10 6 N 3 2 x 10 6 N 1 9 10 5 N

1 2eV m 2 2eV m the The 21 cm radio wave emitted by hydrogen in interstellar space is due to ter interaction called teh hyperfine interaction natomic hydrogen The energy of the emitted wave is nearly 1 10 7 J 2 IJ 3 7 10 J 4 10 J U Rohr s model of a hydrogen atom the enctripetal force is furnished by the Coulomb attraction between te rhit mis the mass and e is the charge on the electre