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हम आपके सपनो को साकार करेंगे III
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14. Two positive charges 12𝜇C and 10 𝜇C are initially separated by 10cm . The work done in bringing the two charges 4cm closer is 7.2 J 3.6 J 8.4J 12.4J
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13.An electric cell does 5joules of work in carrying 10 coulombs of charge around a closed circuit . The emf of the cell is 2v 0.5v 4v 1v
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11. Four charges +3𝜇C , - 1𝜇C , +5𝜇C and - 7𝜇C are arranged on the circumference of a circle of radius 0.5m. The potential at the centre is Zero 18x10^4V -18x10^4V 288x10^3V
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10. Two electric charges of 9𝜇C and - 3𝜇C are placed 0.16m apart in air .there are two points A and B on the line joining the two charges at distances of (a) 0.04m from -3 𝜇C and in between the charges and (b) 0.08m from - 3𝜇C and out side the two charges . The potentials at A and B are 0V ,5V 0V ,0V 5V ,0V 5V ,10V
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9.If 4x10^20eV is required to move a charge of 0.25C between two point , the potential difference between these two points is 256 volt 1/256 volt 256 x 10^(−19) volt 250volt
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7. Two charges of 10𝜇C and -90 𝜇C are separated by a distance 24 cm . Electrostics field strength from the smaller charges is zero at a distance of 12cm 24cm 36cm 48cm
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6.The electric field at (30,30) cm due to a charge of -8nC at the origin in N𝐶^(−1) is -400(𝑖 ̂ +𝑗 ̂) 400(𝑖 ̂ +𝑗 ̂) -200√2(𝑖 ̂ +𝑗 ̂) 200√2(𝑖 ̂ +𝑗 ̂)
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