Given below are two statements, one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A): Gauss's law in magnetostatics and electrostatics are respectively, ∮B·dS = 0 and ∮E·dS = q_enclosed/ε₀. Reason (R): Magnetic monopoles do not exist, whereas electric monopoles (isolated charges) exist.

Assertion (A): The electric field inside a charged metallic sphere is zero. Reason (R): Charges reside only on the outer surface of a conductor. Choose the correct option.

Standard electrode potential of three metals A, B and C are respectively 0.5 V, -3 V and -1.2 V. Reducing power of these metals would be

An electron of mass M kg and charge e coulomb travels from rest through a potential difference of V volts. The final energy in joules would be

The rule to determine the direction of a current induced in a coil due to its rotation in a magnetic field is :

Arrange the following electromagnetic radiations in decreasing order of their frequencies. 1. Gamma rays 2. Ultraviolet rays 3. Radio waves 4. X-rays