ch 1 class 12 physics Electric charges and fields All important Assertion reason based question

Assertion : Magnetic field interacts with a moving charge and not with a stationary charge. Reason : A moving charge produces a magnetic field. (A)If both Assertion & Reason are True &the Reason is a correct explanation of the Assertion. (B)If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. (C)If Assertion is True but the Reason is False. (D)If both Assertion & Reason are false.

Assertion : Half of the ring is uniformly positively charged and other half uniformly negatively charged. Then, electric field is zero at centre. Then , electric field is zero at centre. Reason : At the centre of uniformly charged ring, electric field is zero. 1)If both Assertion and Reason are correct and Reason is the correct explanation of Assertion 2)If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion 3)If Assertion is true but Reason is false 4)If Assertion is false but Reason is true

Assertion : Electrostatic field lines start at positive charges and end at negative charges. Reason : Field lines are continuous curves without any breaks and they form closed loop.

Assertion : When bodies are charged through friction, there is a transfer of electric charge from one body to another, but no creation or destruction of charge. Reason : This follows from conservation of electric charges.

Assertion : Millikan's experiment established that electric charge is quantised. Reason : From this experiment mass of the electron could not be determined.

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion. Velocity of a block changes from (2hati+3hatj) ms^(-1) to (-4hati-6hatj) ms^(-1) . Then, work done by all the forces during this interval of time is positive. Reason Speed of block is increasing.

These question consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following four responses. Assertion: Good conductors of electricity are also good conductors of heat Reason: In good conductors of electricity, there are large numbers of free electrons.

Assertion: On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases Reason: Electric field is inversly proportional to square of distance from the charge or an electric dipole.

Assertion : With the help of Gauss's theorm we can find electric field at any point. Reason : Gauss's theorem can be applied for any type of charge distribution.

Assertion : Electromagnetic waves are transverse in nature Reason : The electric and magnetic fields in electromagnetic waves are perpendicular to each other and to the direction of propagation.