1
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A solid rectangular sheet has two different coefficients of linear expansion $$\alpha$$1 and $$\alpha$$2 along its length and breadth respectively. The coefficient of surface expansion is (for $$\alpha$$1 t << 1, $$\alpha$$2t < <1)
A
$${{{\alpha _1} + {\alpha _2}} \over 2}$$
B
$$2({\alpha _1} + {\alpha _2})$$
C
$${{4{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}$$
D
$${\alpha _1} + {\alpha _2}$$
2
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A positive charge Q is situated at the centre of a cube. The electric flux through any face of the cube is (in SI units)
A
$${Q \over {6{\varepsilon _0}}}$$
B
$$4\pi Q$$
C
$${Q \over {4\pi {\varepsilon _0}}}$$
D
$${Q \over {6\pi {\varepsilon _0}}}$$
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Three capacitors of capacitance 1.0, 2.0 and 5.0 $$\mu$$F are connected in series to a 10 V source. The potential difference across the 2.0$$\mu$$F capacitor is
A
$${{100} \over {17}}$$V
B
$${{20} \over {17}}$$V
C
$${{50} \over {17}}$$V
D
10V
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A charge of 0.8 coulomb is divided into two charges Q1 and Q2. These are kept at a separation of 30 cm. The force on Q1 is maximum when
A
Q1 = Q2 = 0.4 C
B
Q1 $$ \approx $$ 0.8 C, Q2 negligible
C
Q1 negligible, Q2 $$\approx $$ 0.8 C
D
Q1 = 0.2 C, Q2 = 0.6 C
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