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BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

A charge +q is placed at the origin O of XY-axes as shown in the figure. The work done in taking a charge Q from A to B along the straight line AB is

BITSAT 2020 Physics - Electrostatics Question 2 English

A
$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{{a - b} \over {ab}}} \right)$$
B
$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{{b - a} \over {ab}}} \right)$$
C
$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{b \over {{a^2}}} - {1 \over b}} \right)$$
D
$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{a \over {{b^2}}} - {1 \over b}} \right)$$
2
BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

Two small conducting spheres of equal radius have charges +20 $$\mu$$ C and $$-$$40 $$\mu$$C respectively and placed at a distance R from each other experience for F1. If they are brought in contact and separated to the same distance, they experience force F2. The ratio of F1 to F2 is

A
1 : 4
B
+8 : 1
C
$$-$$8 : 1
D
1 : 8
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