Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

Question:

Options :

(a) μoi/r
(b) 4μ,i/r
(c) Zero
(d) μoi/4r

Answer :

(d) μoi/4r

Answer Steps :

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

If a body is executing simple harmonic motion then

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