1
JEE Main 2024 (Online) 29th January Morning Shift
+4
-1

A galvanometer having coil resistance $$10 \Omega$$ shows a full scale deflection for a current of $$3 \mathrm{~mA}$$. For it to measure a current of $$8 \mathrm{~A}$$, the value of the shunt should be:

A
$$3.75 \times 10^{-3} \Omega$$
B
$$3 \times 10^{-3} \Omega$$
C
$$4.85 \times 10^{-3} \Omega$$
D
$$2.75 \times 10^{-3} \Omega$$
2
JEE Main 2024 (Online) 29th January Morning Shift
+4
-1

The electric current through a wire varies with time as $$I=I_0+\beta t$$, where $$I_0=20 \mathrm{~A}$$ and $$\beta=3 \mathrm{~A} / \mathrm{s}$$. The amount of electric charge crossed through a section of the wire in $$20 \mathrm{~s}$$ is :

A
80 C
B
800 C
C
1000 C
D
1600 C
3
JEE Main 2024 (Online) 27th January Evening Shift
+4
-1

Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across $$A$$ and $$B$$, their readings are $$V_1, V_2$$ and $$V_3$$. Choose the correct option.

A
$$V_1=V_2$$
B
$$V_1 \neq V_3-V_2$$
C
$$V_1+V_2=V_3$$
D
$$V_1+V_2>V_3$$
4
JEE Main 2024 (Online) 27th January Evening Shift
+4
-1

A current of $$200 \mu \mathrm{A}$$ deflects the coil of a moving coil galvanometer through $$60^{\circ}$$. The current to cause deflection through $$\frac{\pi}{10}$$ radian is :

A
120 $$\mu$$A
B
180 $$\mu$$A
C
30 $$\mu$$A
D
60 $$\mu$$A
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