Current Electri...

In given figure, the potentiometer wire AB has a resistance of 5 Ω and length 10 m. The balancing length AM for the e.m.f of 0.4 V is

What is the reading of voltmeter in the following figure?

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)

For the post office box arrangement to determine the value of unknown resistance the unknown resistance should be connected between

In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y

The potentiometer is superior to a voltmeter for measuring a potential difference because

The range of a voltmeter of resistance 500 Ω is 10V. The resistance to be connected to convert it into an ammeter of range 10 A is

Three voltmeters A, B and C having resistances R, 1.5R and 3R respectively are used in a circuit as shown. When a P.D. is applied between X and Y, the reading of the voltmeters are V₁, V₂ and V₃ respectively. Then

When the number of turns of the coil is doubled, the current sensitivity of a moving coil galvanometer is doubled whereas the voltage sensitivity of the galvanometer

A galvanometer of resistance 100 Ω is converted to a voltmeter of range 10 V by connecting a resistance of 10 k Ω The resistance required to convert the same galvanometer to an ammeter of range 1 A is