92. The magnetic field intensity (in Aim) at the centre of a circular coil of diameter 1 m and carrying a current of 2 A is

A.8

B.4

C.3

D.2

93. The field at any point on the axis of a current carrying coil will be

A. perpendicular to the axis

B. parallel to the axis

C. at an angle of 45? with the axis

D. zero

94. Consider the following statements: The force per unit length between two stationary parallel wires carrying (steady) currents I. is inversely proportional to the separation of wires. 2. is proportional to the magnitude of each current. 3. satisfies Newton's third law. Of these statements

A. 1 and 2 are correct

B. 2 and 3 are correct

C. 1 and 3 are correct

D. 1, 2 and 3 are correct

95. Permeability is reciprocal of

A. reluctivity

B. susceptibility

C. permittivity

D. conductivity

96. In all cases of electromagnetic induction, an induced voltage will cause a current to flow in a closed circuit in such a direction that the magnetic field which is caused by that current will oppose the change that produces the current, is the original statement of

A. Lenz's law

B.b) Faraday's law of magnetic induction

C. Fleming's law of induction

D. Ampere's law

97. The laws of electromagnetic induction (Faraday's and Lenz's laws) are summarized in the following equation :di

A. e = i R

B. e = L ?dt

C. e = di/dt

D. none of these

98. Which law is synonymous to the occurrence of diamagnetism?

A. Ampere's law

B. Maxwell's law

C. Coulomb's law

D. Lenz's law

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