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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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8.Two electric charges of 10^(−9) C and 〖−10〗^(−9) C are placed at the corners A and B of an equilateral tringle ABC side 5cm . The electric intensity at C is 1800N/C 3600N/C 900N/C 2700N/C

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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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5.An electron (m=9.1x10^(−31)kg) is sent into an electric field of intensity 9.1x10^6 N/c .The acceleration produced is 1.6x10^18 𝑚/𝑠^2 1.6x10^6 𝑚/𝑠^2 1.6x10^(−18) 𝑚/𝑠^2 1.6x10^(−6) 𝑚/𝑠^2

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4.Two equally charged pith balls 3cm apart repel each other with a force of 4x10^(−5)N . The charge on each ball is 2x10^9 C 2x10^(−9) C 2/3x10^9 C 2/3x10^(−9) C

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3. Two charges of +200𝜇C and -200𝜇C are placed at the corners B and C of an equilateral tringle ABC of side 0.1m . The force on a charge of 5 𝜇C placed a is 1800N 1200√3 N 600√3 N 900N

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2.Two charges each 1𝜇𝑐 are at p (2𝑖 ̂ +3𝑗 ̂ +𝑘 ̂) m and Q (𝑖 ̂ +𝑗 ̂ -𝑘 ̂) m . Then the force between them is …………………. 1.100N 2.10N 3.10^4 dyne 4.100 dyne

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1. A charge Q is divided into two parts 𝑞_1 and 𝑞_2 such that they experience maximum force of repulsion when separated by certain distance . The ratio of Q , 𝑞_1 and 𝑞_2 is 1:1:2 1:2:2 2:2:1 2:1:1

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