Overview

In a building there are 15 bulbs of $45\mathrm{W},15$ bulbs of $100\mathrm{W},15$ small fans of $10\mathrm{W}$ and 2 heaters of $1\mathrm{k}\mathrm{W}$ . The voltage of electric main is $220\mathrm{V}$ . The minimum fuse capacity (rated value) of the building will be

In the figure given, the electric current flowing through the 5 k Ω resistor is ‘x’ mA. The value of x to the nearest integer is --------.

A resistor develops 500J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5 A to 3 A, what will be the energy developed in 20 s.

The resistance of a conductor at 15°C is 16Ω and at 100°C is 20Ω. What will be the temperature coefficient of resistance of the conductor?

Consider an electrical circuit containing a two way switch 'S'. Initially S is open and then T? is connected to T?. As the current in R = 6Ω attains a maximum value of steady state level, T? is disconnected from T? and immediately connected to T?. Potential drop across r = 3Ω resistor immediately after T? is connected to T? is _______ V. (Round off to the Nearest Integer)

An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance R that must be put in series with the bulb so that the bulb delivers the same power is _______ Ω.

In the given figure, a battery of emf E is connected across a conductor PQ of length 'l' and different area of cross- sections by having radii r? and r? (r? < r?). Choose the correct option as one moves from P to Q:

A 16Ω wire is bend to form a square loop. A 9V supply having internal resistance of 1Ω is connected across one of its sides. The potential drop across the diagonals of the square loop is __________ x 10?¹ V.

The given potentiometer has its wire of resistance 10Ω. When the sliding contact is in the middle of the potentiometer wire, the potential drop across 2Ω resistor is :

In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm. The ratio of the emf of two cells, ε₁/ε₂,, is: