1
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
A galvanometer of resistance 100 $$\Omega$$ has 50 divisions on its scale and has sensitivitv of 20 $$\mu$$A/division. It is to be converted to a voltmeter with three ranges of 0-2V, 0-10 V and 0-20 V. The appropriate circuit to do so is
A
B
C
D
2
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained :
If V0 is almost zero, identify the correct statement :
A
The value of the resistance R is 1.5 $$\Omega$$
B
The emf of the battery is l.5 V and its internal resistance is 1.5 $$\Omega$$
C
The emf of the battery is l.5 V and the value of R is 1.5 $$\Omega$$
D
The potential difference across the battery is 1.5 V when it sends a current of 1000 mA
3
JEE Main 2019 (Online) 10th April Evening Slot
+4
-1
Space between two concentric conducting spheres of radii a and b (b > a) is filled with a medium of resistivity $$\rho$$. The resistance between the two spheres will be :
A
$${\rho \over {2\pi }}\left( {{1 \over a} + {1 \over b}} \right)$$
B
$${\rho \over {4\pi }}\left( {{1 \over a} + {1 \over b}} \right)$$
C
$${\rho \over {2\pi }}\left( {{1 \over a} - {1 \over b}} \right)$$
D
$${\rho \over {4\pi }}\left( {{1 \over a} - {1 \over b}} \right)$$
4
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
A current of 5 A passes through a copper conductor (resistivity = 1.7 × 10–8 $$\Omega$$m) of radius of cross-section 5 mm. Find the mobility of the charges if their drift velocity is 1.1 × 10–3 m/s.
A
1.3 m2/Vs
B
1.0 m2/Vs
C
1.8 m2/Vs
D
1.5 m2/Vs
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