Let [ϵ0] denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then:
Two short bar magnets of length 1 cm each have magnetic moments 1.20Am2and1.00Am2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid - point O of the line joining their centres is close to (Horizontal component of earths magnetic induction is 3.6×10−5Wb/m2)
The supply voltage to a room is 120 V. The resistance of the lead wires is 6 Ω A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?
Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+andM3+ in its oxide. Fraction of the metal which exists as M3+ would be: