Electrical permittivity (epsilon_0) in vacuum is 3.854times 10^-12 C^2/N-m^2 8.8

Question

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

Explanation / Answer

1)

electric permitivity, eo=8.854*10^-12 C^2/(N.m^2)

option (b) is correct,

2)

torque, T=p*E*sin(theta) =pXE

option (a), (b), (c) are correct

3)

electric field outside the chrged conductor is,

E=sigma/(2*eo)

option (b) is correct

4)

drift speed, Vd=j/n*q

option (b) is correct

5)

electric resistivity, rho=R*A/L

option (a) is correct

6)

charge on discharge capacitor is,

q=qo*e^-t/RC

option (c) is correct

7)

force=q*v*B

m*v^2/r=q*V*B

====> radius, r=m*V/q*B

option (c) is correct

8)

magnetic susceptibility = Km-1

option (c) is correct

9)

induced emf=-d(pi)/dt

option (b) is correct

10)

emf generated in A.C generator=N*B*A*W*sin(w*t)

option (c) is correct

11)

enegry stored in inductor, U=1/2*L*i^2

option (b) is correct

12)

Vrms=Vo/sqrt(2)

option (b) is correct

13)

capacitive reactance, Xc=1/w*c

Xc=1/(2pi*f*C)

option (a) is correct

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