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1. A
   Gravitational force is stronger than electrostatic force.
2. B
   Gravitational as well as electrostatic force is always attractive.
3. C
   Gravitational as well as electrostatic force always act along the line joining the two objects
4. D
   Inverse square law $F \propto \frac{1}{r^2}$ is not observed by electrostatic force.

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1. A
   $4\pi \times 10^{-26}$ T
2. B
   $2\pi \times 10^{-26}$ T
3. C
   $4\pi \times 10^{-19}$ T
4. D
   $2\pi \times 10^{-19}$ T

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1. A
   3:1
2. B
   1:3
3. C
   9:1
4. D
   1:9

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1. A
   $\frac{2+f}{3+f}$
2. B
   $\frac{3+f}{2+f}$
3. C
   $\frac{3+f}{4+f}$
4. D
   $\frac{4+f}{3+f}$

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1. A
   1.65
2. B
   1.60
3. C
   1.55
4. D
   1.50

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1. A
   0.06 m
2. B
   0.10 m
3. C
   0.09 m
4. D
   0.07 m

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1. A
   $\frac{Kq_1q_2x}{d(d-x)}$
2. B
   $\frac{Kq_1q_2d}{(d-x)^2}$
3. C
   $\frac{Kq_1q_2}{d^2-x^2}$
4. D
   $\frac{Kq_1q_2x}{d^2-x^2}$

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1. A
   10 $\Omega$
2. B
   12 $\Omega$
3. C
   15 $\Omega$
4. D
   20 $\Omega$

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1. A
   V·As
2. B
   VA·s
3. C
   V·s/A
4. D
   A/V·s

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1. A
   $\frac{R(1-2^n)}{n}$
2. B
   $\frac{R(1-n)}{2n}$
3. C
   $\frac{R(n-1)}{n}$
4. D
   $\frac{R(2^n-1)}{2^n}$

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1. A
   $7.5 \times 10^{-5}$/°C
2. B
   $6.75 \times 10^{-5}$/°C
3. C
   $2.5 \times 10^{-5}$/°C
4. D
   $1.5 \times 10^{-5}$/°C

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1. A
   $4\pi \times 10^{-7}$ T
2. B
   $5\pi \times 10^{-7}$ T
3. C
   $2\pi \times 10^{-5}$ T
4. D
   $7\pi \times 10^{-6}$ T

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1. A
   6.2
2. B
   5.3
3. C
   4.8
4. D
   7.4

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1. A
   $\frac{3y}{2}$
2. B
   $\frac{2y}{3}$
3. C
   $\frac{5y}{4}$
4. D
   $\frac{4y}{5}$

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1. A
   300 m/s
2. B
   400 m/s
3. C
   500 m/s
4. D
   600 m/s

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1. A
   $\frac{\mu_0 \pi n d^2}{2}$
2. B
   $\frac{4\mu_0 \pi n}{d^2}$
3. C
   $\mu_0 \pi n d^2$
4. D
   $\frac{4\mu_0 \pi n^2 d^2}{4}$

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1. A
   zero
2. B
   $mg$
3. C
   $3\,mg$
4. D
   $6\,mg$

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1. A
   $\frac{N_1 T_1}{N_2 T_2}$
2. B
   $\frac{N_2 T_2}{N_1 T_1}$
3. C
   $\frac{N_1 T_2}{N_2 T_1}$
4. D
   $\frac{N_1 T_2}{N_1 T_2}$

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1. A
   16:1
2. B
   256:1
3. C
   81:1
4. D
   128:1

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1. A
   $\frac{3}{2}T$
2. B
   $\frac{2}{3}T$
3. C
   $\frac{\sqrt{3}}{4}T$
4. D
   $\frac{\sqrt{3}}{4}T$

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1. A
   the momentum changes by mv
2. B
   the momentum changes by 2mv
3. C
   the kinetic energy changes by $\frac{1}{2}mv^2$
4. D
   the kinetic energy changes by $mv^2$

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1. A
   10 $\Omega$
2. B
   15 $\Omega$
3. C
   20 $\Omega$
4. D
   25 $\Omega$

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1. A
   $\frac{1}{2}g t_1 t_2$
2. B
   $\frac{1}{2}g t_1 t_2$
3. C
   $g t_1 t_2$
4. D
   $2g t_1 t_2$

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1. A
   6
2. B
   9
3. C
   12
4. D
   15

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1. A
   $-\frac{2}{\sqrt{3}}q$
2. B
   $+\frac{2}{\sqrt{3}}q$
3. C
   $-\frac{\sqrt{3}}{2}q$
4. D
   $+\frac{\sqrt{3}}{2}q$

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