1
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
$${\rho \over {4\pi }}\left( {{1 \over a} - {1 \over b}} \right)$$
2
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
3
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure
SI. No. R($$\Omega$$) l(cm)
1. 1000 60
2. 100 13
3. 10 1.5
4. 1 1.0
Which of the readings is inconsistent?
A
4
B
3
C
2
D
1
4
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. One may conclude that :
A
$$R(T) = {R_0}{e^{ - {T^2}/T_0^2}}$$
B
$$R(T) = {{{R_0}} \over {{T^2}}}$$
C
$$R(T) = {R_0}{e^{ {T^2}/T_0^2}}$$
D
$$R(T) = {R_0}{e^{ - T_0^2/{T^2}}}$$
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