Work and Energy — Physics STD 12 Science — Question

A truth table is given below. Which of the following has this type of truth table (a) XOR gate(b) NOR gate(c) AND gate(d) OR gate

Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor:

1. Increases.
2. Decreases.
3. Does not change.
4. Is zero.

Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is:

Two positive point charges of 12 μC  and 8 μC  are 10cm apart. The work done in bringing them 4 cm closer is (a) 5.8 J   (b) 5.8 eV(c) 13 J(d) 13 eV

The strength and direction of the magnetic field depends on ..........

is equal to the work done by an external agent in carrying a unit of positive charge from the arbitrarily chosen reference point (usually infinity) to that point without any acceleration.

The electrostatic energy of the system made by two electric dipoles kept at a distance 'r' is proportional to :

A light rays beam enters from air into water. Out of the following which will not be changed ?

 The resistivity of certain metals or alloys drops to zero when they are cooled below a certain temperature, this phenomenon is known as __________.