1
AIPMT 2009
+4
-1
See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?

A
$${\varepsilon _2} - {i_2}{r_2} - {\varepsilon _1} - {i_1}{r_1} = 0$$
B
$$- {\varepsilon _2} - \left( {{i_1} + {i_2}} \right)R + {i_2}{r_2} = 0$$
C
$${\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R + {i_1}{r_1} = 0$$
D
$${\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R - {i_1}{r_1} = 0$$
2
AIPMT 2009
+4
-1
A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is

A
$$3\,\Omega$$
B
$$6\pi \,\Omega$$
C
$$6\,\Omega$$
D
$$0.6\pi \,\Omega$$
3
AIPMT 2009
+4
-1
The mean free path of electrons in a metal is 4 $$\times$$ 10$$-$$8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m
A
$$5 \times {10^{ - 11}}$$
B
8 $$\times$$ 10$$-$$11
C
5 $$\times$$ 107
D
8 $$\times$$ 107
4
AIPMT 2009
+4
-1
A student measures the terminal potential difference (V) of a cell (of emf $$\varepsilon$$ and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then respectively, equal
A
$$-$$ r and $$\varepsilon$$
B
r and $$-$$ $$\varepsilon$$
C
$$-$$ $$\varepsilon$$ and r
D
$$\varepsilon$$ and $$-$$ r
EXAM MAP
Medical
NEET