Electrical permittivity (E_0) in vacuum is (a) 3.854 times 10^12 C^2 /N-m^2 (b)

Question

Electrical permittivity (E_0) in vacuum is (a) 3.854 times 10^12 C^2 /N-m^2 (b) 8.854 times 10^-12 C^2/N-m^2 c) 5.854 times 10^-12 C^2/N-m^2 d) None of the above Torque (tau) due to dipole moment in an electric field is (a) pE sin phi (b) pE cos phi c) pE tan phi d) None The electric field (E) outside the charged conductor is (a) sigma/2 epsilon_o (b) 2 sigma/epsilon_0 c) sigma/epsilon_0 d) None Drift speed (nu_d) is (a) J/n (b) J/nq c) J/q d) None Electrical resistivity (rho) is? (a) RA/L (b) RL/A c) R/AL d) All When capacitor discharges, the charge (q) becomes (a) I-Q_0 e^t/RC b) I-EQ_0 e^t/RC c) Q_0 e^t/RC d) None A particle with mass (m) and charge (q) with initial velocity (v) perpendicular to the field B moves in a circle with radius R of (a) 2mv/qB (b) mv^2/qB c) mv/qB d) None The magnetic susceptibility (a) 2K_m-1 (b) K_m-1/2 c0 K_m-1 d) None Faraday's law measures the induced e.m.f. (epsilon) as a) + (d Phi/dt) b) - (d Phi/dt) c) - d Phi d) None The e.m.f (epsilon) generated in A.C generator is a) N B A omega /sin omega t b) N B A omega cos omega t c) N B A omega sin omega t d) None Energy (U) stored in an inductor is a) LI^2 b) 1/2 LI^2 c) 2LI d) None V_Rms (R.m.s of sinusoidal voltage) is a) V/Squareroot 3 b) V/Squareroot 2 c) V/Squareroot 5 d) None Capacitive reactant (X_c) is a) 1/2 pi f C b) 2 pi f C c) 1/2 pi f C7^2 d) None

Explanation / Answer

1) b

2) a

3) c

4) b

5) a

6) c

7) c

9) b

10) c

11) b

12) b

13) a

All are direct answers. They are just a little shuffle of equations or direct formulae.

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