Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Find the curl of E when B is given as 15t.
b Explanation: From Maxwell first law, we get Curl of E as the negative derivative of B with respect to time. Thus Curl(E) = -dB/dt. On substituting B= 15t and differentiating, Curl(E) = -15 units.
b
See lessExplanation: From Maxwell first law, we get Curl of E as the negative derivative of B with respect to time. Thus Curl(E) = -dB/dt. On substituting B= 15t and differentiating, Curl(E) = -15 units.
The charge density of a field with a position vector as electric flux density is given by
d Explanation: The Gauss law for electric field states that the divergence of the electric flux density is the charge density. Thus Div(D) = ρ. For D as a position vector, the divergence of the position vector D will be always 3. Thus the charge density is also 3.
d
See lessExplanation: The Gauss law for electric field states that the divergence of the electric flux density is the charge density. Thus Div(D) = ρ. For D as a position vector, the
divergence of the position vector D will be always 3. Thus the charge density is also 3.
The line integral of which parameter is zero for static fields?
a Explanation: The field is irrotational for static fields. Thus curl of E is zero. From Stokes theorem, the line integral of E is same as the surface integral of the curl of E. Since it is zero, the line integral of E will also be zero.
a
See lessExplanation: The field is irrotational for static fields. Thus curl of E is zero. From Stokes theorem, the line integral of E is same as the surface integral of the curl of E. Since it is zero, the line integral of E will also be zero.
For static fields, the curl of E will be
b Explanation: For static fields, the charges will be constant and the field is constant. Thus curl of the electric field intensity will be zero. This implies the field is irrotational.
b
See lessExplanation: For static fields, the charges will be constant and the field is constant. Thus curl of the electric field intensity will be zero. This implies the field is irrotational.
Which of the following relations is correct?
c Explanation: The emf induced in a material is given by the line integral of the electric field intensity. Thus EMF = ∫ E.dl is the correct relation
c
See lessExplanation: The emf induced in a material is given by the line integral of the electric
field intensity. Thus EMF = ∫ E.dl is the correct relation
Which of the following relations is correct?
a Explanation: The reluctance is also defined by the ratio of the current element to the flux. In other words, mmf = NI. Thus S = NI/φ. We get the relation NI = Sφ.
a
See lessExplanation: The reluctance is also defined by the ratio of the current element to the flux. In other words, mmf = NI. Thus S = NI/φ. We get the relation NI = Sφ.
The line integral of the electric field intensity is
b Explanation: From the Maxwell first law, the transformer emf is given by the line integral of the electric field intensity. Thus the emf is given by ∫ E.dl.
b
See lessExplanation: From the Maxwell first law, the transformer emf is given by the line integral
of the electric field intensity. Thus the emf is given by ∫ E.dl.
The electric field intensity of a field with velocity 10m/s and flux density of 2.8 units is
b Explanation: The electric field is the product of the velocity and the magnetic flux densitygiven by E = v x B. On substituting v = 10 and B = 2.8, we get E = 10 x 2.8 = 28 units.
b
Explanation: The electric field is the product of the velocity and the magnetic flux densitygiven by E = v x B. On substituting v = 10 and B = 2.8, we get E = 10 x 2.8 = 28 units.
See lessFind the electric field intensity of a charge 2.5C with a force of 3N.
d Explanation: The electric field intensity is the electric force per unit charge. It is given by E = F/q. On substituting F = 2.5 and q = 3, we get E = 3/2.5 units.
d
See lessExplanation: The electric field intensity is the electric force per unit charge. It is given by E = F/q. On substituting F = 2.5 and q = 3, we get E = 3/2.5 units.
Find the emf induced in a coil of 60 turns with a flux rate of 3 units.
b Explanation: The emf induced is the product of the turns and the flux rate. Thus Vemf = -Ndφ/dt. On substituting N = 60 and dφ/dt = 3, we get emf as -60 x 3 = -180 units.
b
See lessExplanation: The emf induced is the product of the turns and the flux rate. Thus Vemf = -Ndφ/dt. On substituting N = 60 and dφ/dt = 3, we get emf as -60 x 3 = -180 units.