Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.

Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is

A resistance of a metal wire of length AB is 2\(\Omega \). Another wire of length PQ of the same metal with twice the diameter of the wire AB is found to have the same resistance of 2\(\Omega \). What is the length of PQ?

The reciprocal of the resistance is__________

A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly ____.

Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?

In electric power transmission, the wastage of power is ___________.

In LCR circuit when K_L = X_c (at resonance) the current _________________

A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.

The wavelength range of microwave is _______m

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is_____. [take wavelength of light, λ = 500 nm]

The work functions for metals A, B and C are 1.92 eV, 2.0 eV and 5.0 eV respectively. The metal/metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are _____.

The ratio between the radius of first three orbits of hydrogen atom is _____.

If a small amount of antimony (Sb) is added to germanium crystal,______.

Which one of the following is the natural nanomaterial.

Write down Coulomb’s law in vector form and mention what each term represents.

What is the electric flux through a cube of side 1 cm which encloses on electric dipole?

Define magnetic flux.

A bar magnet is moved in the direction indicted by the arrow between two coils PQ and CD predict the directions of induced current in each coil.

What are electromagnetic waves?

What are the important points of wave theory of light?

What are thermal neutrons? Why are neutrons considered as ideal particles for nuclear fission?

Give circuit symbol, logical operation, truth table, and Boolean expression of
i) AND gate
ii) OR gate
iii) NOT gate
iv) NAND gate
v) NOR gate and
vi) EX-OR gate.

What does RADAR stand for?

If the resistance of coil is 3 Ω at 20^oC and α = 0.004/^oC then determine its resistance at 100^oC.

Calculate the magnetic field at a point on the axial line of a bar magnet.

In a certain region of space, electric field \(\vec { E } \) and magnetic field \(\vec { B } \) are perpendicular to each other. An electron enters the region perpendicular to the direction of both \(\vec { B } \) & \(\vec { E } \) and moves undeflected. Find the velocity of the electron.

A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.

Explain experimentally observed facts of photoelectric effect with the help of Einstein’s explanation.

Write the properties of neutrino?

Explain the basic elements of communication system with the necessary block diagram.

What happens when and electric dipole is held in a non-uniform electric field?

Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across each resistors in the circuit.