• #### 1.  The ratio of voltage sensitivity ( V_sVs​ ) and current sensitivity ( IsI_sIs​ ) of a moving coil galvanometer is (G =conductance)

• 1G\frac{1}{G}G1​
• 1G2\frac{1}{G^2}G21​
• GGG
• G2G^2G2

• i α tanθ
• i α θ
• i α θ2
• i α θ3

• c/BAn
• BAn/c
• #### 4.  What is meant by the figure of merit of a galvanometer?

• Maximum deflection on the galvanometer
• Current required to produce unit deflection on the galvanometer
• Voltage required to produce unit deflection on the galvanometer

• B
• 2B
• 4B
• 8B

• I ∝ tanΦ
• I ∝ Φ
• I ∝ Φ2
• I ∝ tan2Φ
• #### 7.  The direction of the force on a current-carrying wire placed in a magnetic field depends on

• the direction of the current
• the direction of the field
• the direction of current as well as field
• neither the direction of current nor the direction of field

• E/B
• B/E
• E x B
• E.B
• #### 9.  Currents of 10 A and 2 A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire B which is situated at 10 cm from A, is

• 8 x 10 ^ -5 N
• 6 x 10 ^-5 N
• 4 x 10 ^ -5 N
• 2 X 10 ^ -5 N
• #### 10.  What is the principle of Moving Coil Galvanometer.

• Current carrying coil in an electric field experiences a force
• Current carrying coil in magnetic field experiences no force
• Current carrying conductor in magnetic field experiences a force
• Current carrying conductor in an electric field produces no force
• #### 11.  The sensitivity of a moving coil galvanometer can be increased by decreasing

• the number of turns in the coil
• the area of the coil
• the magnetic field
• the restoring torque per unit twist of the suspension
• #### 12.  A 100 turns coil shown in the figure carries a current of 2 A in a magnetic field of .2Wbm2 The torque acting on the coil is

• 0.32 N-m tending to rotate the side AC into the page
• 0.32 N-m tending to rotate the side AC out of the page
• 0.64 N-m tending to rotate the side AC into the page
• 0.64 N-m tending to rotate the side AC out of the page

• 0.1 Ω
• 0.2 Ω
• 0.01 Ω
• 0.02 Ω
• #### 14.  Current sensitivity of a galvanometer can be increased by decreasing :

• Magnetic field B
• number of turns N
• torsional constant K
• Area A
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