JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Current Electricity

WhatsApp Email

A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6 mA it produces a deflection of

2^{\circ}

, its figure of merit is close to:

(A) $66 6^{\circ} A / div$ .
(B) $6 \times 1 0^{- 3} A / div$ .
(C) $33 3^{\circ} A / div$ .
(D) $3 \times 1 0^{- 3} A / div$ .✓ Correct

Answer: (D)

Solution

The figure of merit of a galvanometer is the current needed per unit deflection,

\frac{i}{θ}

. With

i = 6

= 6 \times 1 0^{- 3}

A producing a deflection of

2^{\circ}

, the figure of merit is

\frac{6 \times 1 0 ^{- 3}}{2} = 3 \times 1 0^{- 3}

A per division.

JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on Current Electricity →

More JEE Main questions on Current Electricity

A meter bridge with two resistances $R_{1}$ and $R_{2}$ as shown in figure was balanced (null point) at 40 cm from the point P. The null point changed to 50 cm from the point P, when $16Ω$ resistance is connected in parallel to $R_{2}$ . The values of resistances $R_{1}$ and $R_{2}$ ar …
JEE Main 2026View solution →
An electric power line having total resistance of $2Ω$ , delivers 1 kW of power of 250 V. The percentage efficiency of transmission line is $____$ .
JEE Main 2026View solution →
A cylindrical conductor of length 2 m and area of cross-section $0.2 mm^{2}$ carries an electric current of 1.6 A when its ends are connected to a 2 V battery. Mobility of electrons in the conductor is $α \times 1 0^{- 3} m^{2} / V$ .s. The value of …
JEE Main 2026View solution →
The charge stored by the capacitor C in the given circuit in the steady state is $____$ $μ C$ .
JEE Main 2026View solution →
The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If P is the point where the galvanometer shows zero reading then the length AP is $____$ cm .
JEE Main 2026View solution →
A battery with EMF E and internal resistance $r$ is connected across a resistance $R$ . The power consumption in R will be maximum when :
JEE Main 2026View solution →