List of top Physics Questions on Electric charges and fields asked in CUET (UG)

Choose the correct statements from the following:
A. The total charge in any isolated system remains constant.
B. When some charge is transferred to a conductor, it stays at the same place without getting distributed over the entire surface.
C. One Coulomb of negative charge is the total charge of \(6.25 \times 10^{18}\) electrons.
D. Electric field is a scalar field.
E. Permanent dipole means that the dipole moment \(\vec{P}\) exists irrespective of external electric field \(\vec{E}\).

Two point charges +4µC and -2µC are placed at a certain distance in air. They experience an attractive force F. If they are brought in contact with each other and then separated to the same distance, the new repulsive force between them will be :

Two point charges (-q) and (+4q) are placed at that separation ‘r’. Where should a third charge be placed so that the entire system of charges becomes in equilibrium?

Match list I with list II

	List I (electronic device)		List-II(Use/application)
A	Photodiode	I	Remote controls
B	Zener diode	II.	Amplifier
C	Light emitting diode	III	Voltage regulator
D	Transistor	IV	Photodetector

Choose the correct answer from the options given below: