Physics

A bandwidth of 6 MHz is available for A.M. transmission. If the maximum audio signal frequency used for modulating the carrier wave is not to exceed 6 kHz. The number of stations that can be broadcasted within this band simultaneously without interfering with each other will be_______.

A resistor dissipates 192 J of energy in 1s when a current of 4A is passed4 through it. Now, when the current is doubled, the amount of thermal energy dissipated in 5s in________J.

The diameter of a spherical bob is measured using a vernier calipers. 9 divisions of the main scale, in the vernier caliper, are equal to 10 divisions of vernier scale. One main scale division is 1mm. The main scale reading is 10mm and 8^th division of vernier scale was found to coincide exactly with one of the main scale division. If the given vernier calipers has positive zero error of 0.04cm, then the radius of the bob is______ * 10^-2cm.

A particle is moving with constant acceleration 'a'. Following graph shows ${\nu }^2$  versus x (displacement) plot. The acceleration of the particle is______ m/s².

The ranges and heights for two projectiles projected with the same initial velocity at angles 42° and 48° with the horizontal are R₁, R₂ and H₁, H₂ respectively. Choose the correct option:

Choose the incorrect statement :

(A) The electric lines of force entering into a Gaussian surface provide negative flux.

(B) A charge 'q' is placed at the centre of a cube. The flux through all the faces will be the same.

(C) In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.

(D) When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux.

Choose the most appropriate answer from the options given below

A current of 1.5 A is flowing through a triangle, of side 9cm each. The magnetic field at the centroid of the triangle is:

(Assume that the current is flowing in the clockwise direction.)

Electric field of a plane electromagnetic wave propagating through a non-magnetic medium is given by E = $20cos\left(2*10^{10}t-200x\right)V/m.$  The dielectric constant of the medium is equal to:

(Take   ${\mu }_r=1)$

Statement-I : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load RL.

Statement-II : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with RL.

In the light of the above statements, choose the most appropriate answer from the options given below:

A coil is placed in a magnetic field as shown below: B

A current is induced in the coil because $\overrightarrow{B}$  is: