Out of two copper spheres of the same size, x is hollow while y is solid. If they are charged to the same potential, then which of the following statement(s) is/are correct about the charges on them?

Two concentric different loops lie on the same plane. The current in the inner loop is clockwise and is a function of time. The induced current in the outer loop is(a) 

An inductor of inductive reactance 18 85. Ω is connected to a 220 V, 100 Hz AC source. The inductance is____ 

A parallel plate capacitor is initially charged and then is isolated. The effect of increasing the plate separation on charge, potential and capacitance respectively are______.

A wire has resistance of 10Ω. If it is stretched by (1/10)th of its length, then its resistance is nearly_______.

The ultimate individual unit of magnetism in any magnet is a__________.

The amount of energy released by a capacitor is 10 J. If the charge stored in it is 0.1 C, then the potential difference across it the capacitor will be____. 

Considering a spherical gaussian surface enclosing a point charge. If the radius of the surface becomes double, then the electric flux will__________. 

Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is

When a wire is stretched uniformly 8 times its original length, the new resistance is640 Ω. The value of initial resistance is _________.

Three identical cells each of emf 9V and internal resistance 1Ω are connected in series to the resistor of 6Ω. The value of current in the circuit is___________.

Choose the correct option for which Ohm’s law is valid.

A current loop in a magnetic field

The net magnetic flux passing through a hypothetical closed surface enclosing a bar magnet is (in magnitude only)________.

The induced emf in a coil of 10 H inductance in which current varies from 9 A to 4 A in0.2 s is__________.

Oscillating metallic pendulum directed perpendicular to the plane of oscillation slows down due to __________.

 Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statement(s) is/are incorrect?

A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a220 V source. When the capacitor is 50% charged, the peak value of the current is ____________.

The energy dissipated by a wire in 0.5 h is 72 kJ. If 2A current flows in the wire, then the value of resistance is _________.

If both the resistance and the inductance in an L-R AC series circuit are doubled, the new impedance will be _________________.

A direct current I flows along the length of an infinitely long straight thin walled pipe ,then the magnetic field is______________.

If a transformer of an audio amplifier has output impedance 8000 Ω and the speaker has input impedance of 8 Ω. The secondary and primary turns of this transformer connected between the output of amplifier and to loudspeaker should have the ratio?

A cylindrical rod is reformed to half of its original length, keeping volume constant. Its resistance after reformation is R, then the original resistance is

In the presence of large external electric field, non-polar dielectric will behave as

The value of electric field is reduced in a dielectric slab due to,

Which of the following material can be used as a dielectric? 

When the distance between two charged particles is halved, the Coulomb force between them becomes 

A method for charging a conductor without bringing a charged object in contact with it is called 

There are two kinds of charges—positive charge and negative charge. The property which differentiates the two kinds of charges is called

A hemisphere is uniformly charged positively. The electric field at a point on a diameter away from the centre is directed  

When air is replaced by a medium of dielectric constant K, the force of attraction between two charges separated by a distance r ,___________________

A body can be negatively charged by_________________.

Which of the following is not a property of field lines?

Gauss's law is valid for 

A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is 

A cup contains 250 g of water. The number of negative charges present in the cup of water is    

A magnetic dipole which is the arrangement of two magnetic poles of equal and opposite strength separated by some distance is placed in a uniform magnetic field. The net magnetic force on the dipole,___________.

All the edges of a block with parallel faces are unequal. Its longest edge is twice its shortest edge, then ratio of the maximum and minimum resistances between parallel faces is______

The amount of energy released by a capacitor is 10 J. If the charge stored in it is 0.1 C, then the potential difference across it the capacitor will be____. 

A hollow metal sphere of radius 5 cm is charged, such that the potential on its surface becomes 90 V. The potential at the centre of the sphere, will be____.

According to phenomenon of mutual inductance ,