- A10
- B3 × 109
- C4.8 × 10-10
- D0.1
Explanation:
1 emu charge is equal to 10-coulomb charge while 1 coulomb is equal to 3 × 109 esu charge. Emu and C both are the units of charge and hence their conversion formula is necessary for many numerical problems.
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The resistance of an ideal ammeter is
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(a) Infinite |
(b) Very high |
(c) Small |
(d) Zero |
The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as
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(a) Transmission |
(b) Reception |
(c) Modulation |
(d) Detection |
A current of 10A is passing through a long wire which has semicircular loop of the radius 20cm as shown in the figure. Magnetic field produced at the centre of the loop is
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(a) 10 πμT |
(b) 5 πμT |
(c) 4 πμT |
(d) 2 πμT |

In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
|
(a) |
(b) |
(c) 4C |
(d) 2C |